diff --git a/docs/configuration/conditions.md b/docs/configuration/conditions.md
index e47786db..9d4343b5 100644
--- a/docs/configuration/conditions.md
+++ b/docs/configuration/conditions.md
@@ -272,6 +272,28 @@ almost certainly not useful / reliable as a condition.
 
 See [Home Assistant conditions documentation](https://www.home-assistant.io/dashboards/conditional/#state).
 
+## `template`
+
+Matches based on a template.
+
+```yaml
+conditions:
+  - condition: template
+    # [...]
+```
+
+| Parameter        | Description                                                                        |
+| ---------------- | ---------------------------------------------------------------------------------- |
+| `condition`      | Must be `template`.                                                                |
+| `value_template` | The Home Assistant template to check, e.g. `{{ states('switch.office') == 'on' }}` |
+
+See [Home Assistant conditions documentation](https://www.home-assistant.io/docs/scripts/conditions/#template-condition).
+
+?> The Advanced Camera Card uses
+[ha-nunjucks](https://github.com/Nerwyn/ha-nunjucks) to process templates.
+Consult its documentation for the wide variety of different template values
+supported.
+
 ## `triggered`
 
 Matches based on whether the selected camera has been triggered.
diff --git a/src/card-controller/hass/hass-manager.ts b/src/card-controller/hass/hass-manager.ts
index c26cc71a..b98486a5 100644
--- a/src/card-controller/hass/hass-manager.ts
+++ b/src/card-controller/hass/hass-manager.ts
@@ -47,8 +47,7 @@ export class HASSManager {
     this._hass = hass;
 
     this._api.getConditionStateManager().setState({
-      state: this._hass.states,
-      user: this._hass.user,
+      hass: this._hass,
     });
 
     // Theme may depend on HASS.
diff --git a/src/conditions/conditions-manager.ts b/src/conditions/conditions-manager.ts
index e862bf44..6ca004b8 100644
--- a/src/conditions/conditions-manager.ts
+++ b/src/conditions/conditions-manager.ts
@@ -1,3 +1,4 @@
+import { TemplateRenderer } from '../card-controller/templates';
 import { getConfigValue } from '../config/management';
 import { AdvancedCameraCardCondition } from '../config/schema/conditions/types';
 import { isCompanionApp } from '../utils/companion';
@@ -23,6 +24,7 @@ export class ConditionsManager implements ConditionsManagerReadonlyInterface {
   protected _listeners: ConditionsListener[] = [];
   protected _mediaQueries: MediaQueryList[] = [];
   protected _evaluation: ConditionsEvaluationResult = { result: false };
+  protected _templateRenderer: TemplateRenderer = new TemplateRenderer();
 
   constructor(
     conditions: AdvancedCameraCardCondition[],
@@ -127,8 +129,8 @@ export class ConditionsManager implements ConditionsManagerReadonlyInterface {
     switch (condition.condition) {
       case undefined:
       case 'state': {
-        const fromState = oldState?.state?.[condition.entity]?.state;
-        const toState = newState?.state?.[condition.entity]?.state;
+        const fromState = oldState?.hass?.states?.[condition.entity]?.state;
+        const toState = newState?.hass?.states?.[condition.entity]?.state;
 
         return {
           result:
@@ -207,17 +209,18 @@ export class ConditionsManager implements ConditionsManagerReadonlyInterface {
       case 'numeric_state':
         return {
           result:
-            !!newState?.state &&
-            condition.entity in newState.state &&
-            newState.state[condition.entity].state !== undefined &&
+            !!newState?.hass?.states &&
+            condition.entity in newState.hass?.states &&
+            newState.hass.states[condition.entity].state !== undefined &&
             (condition.above === undefined ||
-              Number(newState.state[condition.entity].state) > condition.above) &&
+              Number(newState.hass.states[condition.entity].state) > condition.above) &&
             (condition.below === undefined ||
-              Number(newState.state[condition.entity].state) < condition.below),
+              Number(newState.hass.states[condition.entity].state) < condition.below),
         };
       case 'user':
         return {
-          result: !!newState?.user && condition.users.includes(newState.user.id),
+          result:
+            !!newState?.hass?.user && condition.users.includes(newState.hass.user.id),
         };
       case 'media_loaded':
         return {
@@ -341,6 +344,16 @@ export class ConditionsManager implements ConditionsManagerReadonlyInterface {
           ).result,
         };
       }
+      case 'template':
+        return {
+          result:
+            !!newState?.hass &&
+            this._templateRenderer.renderRecursively(
+              newState.hass,
+              condition.value_template,
+              { conditionState: newState },
+            ) === true,
+        };
     }
   }
 }
diff --git a/src/conditions/types.ts b/src/conditions/types.ts
index e5375d70..fdcbd3c4 100644
--- a/src/conditions/types.ts
+++ b/src/conditions/types.ts
@@ -1,8 +1,7 @@
-import { HassEntities } from 'home-assistant-js-websocket';
 import { KeysState, MicrophoneState } from '../card-controller/types';
 import { ViewDisplayMode } from '../config/schema/common/display';
 import { AdvancedCameraCardConfig } from '../config/schema/types';
-import { CurrentUser } from '../ha/types';
+import { HomeAssistant } from '../ha/types';
 import { MediaLoadedInfo } from '../types';
 
 export interface ConditionState {
@@ -16,9 +15,8 @@ export interface ConditionState {
   keys?: KeysState;
   mediaLoadedInfo?: MediaLoadedInfo | null;
   microphone?: MicrophoneState;
-  state?: HassEntities;
+  hass?: HomeAssistant;
   triggered?: Set<string>;
-  user?: CurrentUser;
   userAgent?: string;
   view?: string;
 }
diff --git a/src/config/schema/conditions/stock/template.ts b/src/config/schema/conditions/stock/template.ts
new file mode 100644
index 00000000..a4fabf10
--- /dev/null
+++ b/src/config/schema/conditions/stock/template.ts
@@ -0,0 +1,7 @@
+import { z } from 'zod';
+
+// https://www.home-assistant.io/docs/scripts/conditions/#template-condition
+export const templateConditionSchema = z.object({
+  condition: z.literal('template'),
+  value_template: z.string(),
+});
diff --git a/src/config/schema/conditions/types.ts b/src/config/schema/conditions/types.ts
index 17c6881f..4ab7ffc6 100644
--- a/src/config/schema/conditions/types.ts
+++ b/src/config/schema/conditions/types.ts
@@ -15,6 +15,7 @@ import { viewConditionSchema } from './custom/view';
 import { numericStateConditionSchema } from './stock/numeric';
 import { screenConditionSchema } from './stock/screen';
 import { stateConditionSchema } from './stock/state';
+import { templateConditionSchema } from './stock/template';
 import { usersConditionSchema } from './stock/users';
 
 // https://www.home-assistant.io/docs/scripts/conditions/#or-condition
@@ -65,6 +66,7 @@ export const advancedCameraCardConditionSchema = z.union([
   orConditionSchema,
   andConditionSchema,
   notConditionSchema,
+  templateConditionSchema,
 
   // Custom conditions:
   cameraConditionSchema,
diff --git a/tests/card-controller/hass/hass-manager.test.ts b/tests/card-controller/hass/hass-manager.test.ts
index 34f74817..900c2d5e 100644
--- a/tests/card-controller/hass/hass-manager.test.ts
+++ b/tests/card-controller/hass/hass-manager.test.ts
@@ -9,7 +9,6 @@ import {
   createHASS,
   createStateEntity,
   createStore,
-  createUser,
   createView,
 } from '../../test-utils';
 
@@ -50,17 +49,13 @@ describe('HASSManager', () => {
   it('should set condition manager state', () => {
     const api = createCardAPI();
     const manager = new HASSManager(api);
-
-    const states = { 'switch.foo': createStateEntity() };
-    const user = createUser({ id: 'user_1' });
-    const hass = createHASS(states, user);
+    const hass = createHASS();
 
     manager.setHASS(hass);
 
     expect(api.getConditionStateManager().setState).toBeCalledWith(
       expect.objectContaining({
-        state: states,
-        user: user,
+        hass: hass,
       }),
     );
   });
diff --git a/tests/conditions/conditions-manager.test.ts b/tests/conditions/conditions-manager.test.ts
index 99e9e844..265f9e90 100644
--- a/tests/conditions/conditions-manager.test.ts
+++ b/tests/conditions/conditions-manager.test.ts
@@ -1,9 +1,12 @@
+import { HassEntities } from 'home-assistant-js-websocket';
 import { afterEach, describe, expect, it, vi } from 'vitest';
 import { MicrophoneState } from '../../src/card-controller/types';
 import { ConditionsManager } from '../../src/conditions/conditions-manager';
 import { ConditionStateManager } from '../../src/conditions/state-manager';
+import { HomeAssistant } from '../../src/ha/types';
 import {
   createConfig,
+  createHASS,
   createMediaLoadedInfo,
   createStateEntity,
   createUser,
@@ -193,7 +196,9 @@ describe('ConditionsManager', () => {
           manager.addListener(listener);
 
           stateManager.setState({
-            state: { 'binary_sensor.foo': createStateEntity({ state: 'on' }) },
+            hass: createHASS({
+              'binary_sensor.foo': createStateEntity({ state: 'on' }),
+            }),
           });
           expect(listener).toBeCalledWith({
             result: true,
@@ -207,7 +212,9 @@ describe('ConditionsManager', () => {
           expect(listener).toBeCalledTimes(1);
 
           stateManager.setState({
-            state: { 'binary_sensor.foo': createStateEntity({ state: 'off' }) },
+            hass: createHASS({
+              'binary_sensor.foo': createStateEntity({ state: 'off' }),
+            }),
           });
           expect(listener).toBeCalledWith({
             result: true,
@@ -238,11 +245,13 @@ describe('ConditionsManager', () => {
 
             expect(manager.getEvaluation().result).toBeFalsy();
             stateManager.setState({
-              state: { 'binary_sensor.foo': createStateEntity() },
+              hass: createHASS({ 'binary_sensor.foo': createStateEntity() }),
             });
             expect(manager.getEvaluation().result).toBeTruthy();
             stateManager.setState({
-              state: { 'binary_sensor.foo': createStateEntity({ state: 'off' }) },
+              hass: createHASS({
+                'binary_sensor.foo': createStateEntity({ state: 'off' }),
+              }),
             });
             expect(manager.getEvaluation().result).toBeFalsy();
           });
@@ -262,15 +271,19 @@ describe('ConditionsManager', () => {
 
             expect(manager.getEvaluation().result).toBeFalsy();
             stateManager.setState({
-              state: { 'binary_sensor.foo': createStateEntity() },
+              hass: createHASS({ 'binary_sensor.foo': createStateEntity() }),
             });
             expect(manager.getEvaluation().result).toBeTruthy();
             stateManager.setState({
-              state: { 'binary_sensor.foo': createStateEntity({ state: 'active' }) },
+              hass: createHASS({
+                'binary_sensor.foo': createStateEntity({ state: 'active' }),
+              }),
             });
             expect(manager.getEvaluation().result).toBeTruthy();
             stateManager.setState({
-              state: { 'binary_sensor.foo': createStateEntity({ state: 'off' }) },
+              hass: createHASS({
+                'binary_sensor.foo': createStateEntity({ state: 'off' }),
+              }),
             });
             expect(manager.getEvaluation().result).toBeFalsy();
           });
@@ -292,11 +305,13 @@ describe('ConditionsManager', () => {
 
             expect(manager.getEvaluation().result).toBeFalsy();
             stateManager.setState({
-              state: { 'binary_sensor.foo': createStateEntity() },
+              hass: createHASS({ 'binary_sensor.foo': createStateEntity() }),
             });
             expect(manager.getEvaluation().result).toBeFalsy();
             stateManager.setState({
-              state: { 'binary_sensor.foo': createStateEntity({ state: 'off' }) },
+              hass: createHASS({
+                'binary_sensor.foo': createStateEntity({ state: 'off' }),
+              }),
             });
             expect(manager.getEvaluation().result).toBeTruthy();
           });
@@ -315,15 +330,21 @@ describe('ConditionsManager', () => {
             stateManager,
           );
 
-          expect(manager.getEvaluation().result).toBeFalsy();
-          stateManager.setState({ state: { 'binary_sensor.foo': createStateEntity() } });
           expect(manager.getEvaluation().result).toBeFalsy();
           stateManager.setState({
-            state: { 'binary_sensor.foo': createStateEntity({ state: 'active' }) },
+            hass: createHASS({ 'binary_sensor.foo': createStateEntity() }),
           });
           expect(manager.getEvaluation().result).toBeFalsy();
           stateManager.setState({
-            state: { 'binary_sensor.foo': createStateEntity({ state: 'off' }) },
+            hass: createHASS({
+              'binary_sensor.foo': createStateEntity({ state: 'active' }),
+            }),
+          });
+          expect(manager.getEvaluation().result).toBeFalsy();
+          stateManager.setState({
+            hass: createHASS({
+              'binary_sensor.foo': createStateEntity({ state: 'off' }),
+            }),
           });
           expect(manager.getEvaluation().result).toBeTruthy();
         });
@@ -341,10 +362,14 @@ describe('ConditionsManager', () => {
           );
 
           expect(manager.getEvaluation().result).toBeFalsy();
-          stateManager.setState({ state: { 'binary_sensor.foo': createStateEntity() } });
+          stateManager.setState({
+            hass: createHASS({ 'binary_sensor.foo': createStateEntity() }),
+          });
           expect(manager.getEvaluation().result).toBeTruthy();
           stateManager.setState({
-            state: { 'binary_sensor.foo': createStateEntity({ state: 'off' }) },
+            hass: createHASS({
+              'binary_sensor.foo': createStateEntity({ state: 'off' }),
+            }),
           });
           expect(manager.getEvaluation().result).toBeFalsy();
         });
@@ -363,10 +388,10 @@ describe('ConditionsManager', () => {
           manager.addListener(listener);
 
           stateManager.setState({
-            state: {
+            hass: createHASS({
               'switch.one': createStateEntity({ state: 'on' }),
               'switch.two': createStateEntity({ state: 'off' }),
-            },
+            }),
           });
           expect(listener).toHaveBeenLastCalledWith({
             result: true,
@@ -380,10 +405,10 @@ describe('ConditionsManager', () => {
           });
 
           stateManager.setState({
-            state: {
+            hass: createHASS({
               'switch.one': createStateEntity({ state: 'off' }),
               'switch.two': createStateEntity({ state: 'on' }),
-            },
+            }),
           });
 
           expect(listener).toHaveBeenLastCalledWith({
@@ -411,10 +436,11 @@ describe('ConditionsManager', () => {
           const listener = vi.fn();
           manager.addListener(listener);
 
+          const hass = createHASS({
+            'switch.one': createStateEntity({ state: 'on' }),
+          });
           stateManager.setState({
-            state: {
-              'switch.one': createStateEntity({ state: 'on' }),
-            },
+            hass,
           });
           expect(listener).toBeCalledTimes(1);
           expect(manager.getEvaluation()).toEqual({
@@ -428,11 +454,7 @@ describe('ConditionsManager', () => {
             },
           });
 
-          stateManager.setState({
-            state: {
-              'switch.one': createStateEntity({ state: 'on' }),
-            },
-          });
+          stateManager.setState({ hass });
           expect(listener).toBeCalledTimes(1);
         });
       });
@@ -453,11 +475,11 @@ describe('ConditionsManager', () => {
 
           expect(manager.getEvaluation().result).toBeFalsy();
           stateManager.setState({
-            state: { 'sensor.foo': createStateEntity({ state: '11' }) },
+            hass: createHASS({ 'sensor.foo': createStateEntity({ state: '11' }) }),
           });
           expect(manager.getEvaluation().result).toBeTruthy();
           stateManager.setState({
-            state: { 'binary_sensor.foo': createStateEntity({ state: '9' }) },
+            hass: createHASS({ 'binary_sensor.foo': createStateEntity({ state: '9' }) }),
           });
           expect(manager.getEvaluation().result).toBeFalsy();
         });
@@ -477,16 +499,74 @@ describe('ConditionsManager', () => {
 
           expect(manager.getEvaluation().result).toBeFalsy();
           stateManager.setState({
-            state: { 'sensor.foo': createStateEntity({ state: '11' }) },
+            hass: createHASS({ 'sensor.foo': createStateEntity({ state: '11' }) }),
           });
           expect(manager.getEvaluation().result).toBeFalsy();
           stateManager.setState({
-            state: { 'sensor.foo': createStateEntity({ state: '9' }) },
+            hass: createHASS({ 'sensor.foo': createStateEntity({ state: '9' }) }),
           });
           expect(manager.getEvaluation().result).toBeTruthy();
         });
       });
 
+      describe('with template condition', () => {
+        const createHASSForTemplateCondition = (states: HassEntities): HomeAssistant => {
+          const hass = createHASS(states);
+          vi.mocked(hass.connection.sendMessagePromise).mockResolvedValue([]);
+          return hass;
+        };
+
+        it('should evaluate true when template evalutes to true', () => {
+          const stateManager = new ConditionStateManager();
+          const manager = new ConditionsManager(
+            [
+              {
+                condition: 'template' as const,
+                value_template: '{{ is_state("sensor.foo", "on") }}',
+              },
+            ],
+            stateManager,
+          );
+
+          expect(manager.getEvaluation().result).toBeFalsy();
+
+          stateManager.setState({
+            hass: createHASSForTemplateCondition({
+              'sensor.foo': createStateEntity({ state: 'on' }),
+            }),
+          });
+          expect(manager.getEvaluation().result).toBeTruthy();
+
+          stateManager.setState({
+            hass: createHASSForTemplateCondition({
+              'sensor.foo': createStateEntity({ state: 'off' }),
+            }),
+          });
+          expect(manager.getEvaluation().result).toBeFalsy();
+        });
+
+        it('should evaluate false when template evalutes to non-boolean', () => {
+          const stateManager = new ConditionStateManager();
+          const manager = new ConditionsManager(
+            [
+              {
+                condition: 'template' as const,
+                // This does not result in a boolean.
+                value_template: '{{ hass.states["light.office"].state }}',
+              },
+            ],
+            stateManager,
+          );
+
+          stateManager.setState({
+            hass: createHASSForTemplateCondition({
+              'light.office': createStateEntity({ state: 'on' }),
+            }),
+          });
+          expect(manager.getEvaluation().result).toBeFalsy();
+        });
+      });
+
       it('should not call listeners for HA state changes without relevant condition', () => {
         const stateManager = new ConditionStateManager();
         const manager = new ConditionsManager(
@@ -503,7 +583,7 @@ describe('ConditionsManager', () => {
         manager.addListener(listener);
 
         stateManager.setState({
-          state: { 'sensor.foo': createStateEntity({ state: '11' }) },
+          hass: createHASS({ 'sensor.foo': createStateEntity({ state: '11' }) }),
         });
 
         expect(listener).not.toBeCalled();
@@ -524,11 +604,11 @@ describe('ConditionsManager', () => {
 
       expect(manager.getEvaluation().result).toBeFalsy();
       stateManager.setState({
-        user: createUser({ id: 'user_1' }),
+        hass: createHASS({}, createUser({ id: 'user_1' })),
       });
       expect(manager.getEvaluation().result).toBeTruthy();
       stateManager.setState({
-        user: createUser({ id: 'user_WRONG' }),
+        hass: createHASS({}, createUser({ id: 'user_WRONG' })),
       });
       expect(manager.getEvaluation().result).toBeFalsy();
     });
diff --git a/tests/conditions/state-manager.test.ts b/tests/conditions/state-manager.test.ts
index ed4259a8..b1c6b837 100644
--- a/tests/conditions/state-manager.test.ts
+++ b/tests/conditions/state-manager.test.ts
@@ -1,6 +1,6 @@
 import { afterEach, describe, expect, it, vi } from 'vitest';
 import { ConditionStateManager } from '../../src/conditions/state-manager';
-import { createStateEntity } from '../test-utils';
+import { createHASS, createStateEntity } from '../test-utils';
 
 describe('ConditionStateManager', () => {
   afterEach(() => {
@@ -46,9 +46,9 @@ describe('ConditionStateManager', () => {
       expect(listener).toBeCalledTimes(1);
 
       manager.setState({
-        state: {
+        hass: createHASS({
           'binary_sensor.foo': createStateEntity(),
-        },
+        }),
       });
       expect(listener).toBeCalledTimes(2);
 
@@ -56,24 +56,24 @@ describe('ConditionStateManager', () => {
       expect(listener).toBeCalledTimes(2);
 
       manager.setState({
-        state: {
+        hass: createHASS({
           'binary_sensor.foo': createStateEntity(),
-        },
+        }),
       });
-      expect(listener).toBeCalledTimes(2);
-
-      manager.setState({ fullscreen: false });
       expect(listener).toBeCalledTimes(3);
 
       manager.setState({ fullscreen: false });
-      expect(listener).toBeCalledTimes(3);
+      expect(listener).toBeCalledTimes(4);
+
+      manager.setState({ fullscreen: false });
+      expect(listener).toBeCalledTimes(4);
 
       manager.setState({
-        state: {
+        hass: createHASS({
           'binary_sensor.foo': createStateEntity({ state: 'off' }),
-        },
+        }),
       });
-      expect(listener).toBeCalledTimes(4);
+      expect(listener).toBeCalledTimes(5);
     });
   });
 
diff --git a/tests/test-utils.ts b/tests/test-utils.ts
index 57057a78..529f2cb8 100644
--- a/tests/test-utils.ts
+++ b/tests/test-utils.ts
@@ -96,6 +96,7 @@ export const createHASS = (states?: HassEntities, user?: CurrentUser): HomeAssis
     hass.user = user;
   }
   hass.connection.subscribeMessage = vi.fn();
+  hass.connection.sendMessagePromise = vi.fn();
   return hass;
 };