diff --git a/CHANGELOG.md b/CHANGELOG.md
index b4dec06303aea..ee36fc9281ee7 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,7 @@
 - [cpp] added new `cpp.clangdExecutable` and `cpp.clangdArgs` to customize language server start command.
 - [monaco] Fix document-saving that was taking too long.
 - [plug-in] added `tasks.onDidStartTask` Plug-in API
+- [plug-in] added `tasks.onDidEndTask` Plug-in API
 - Enabled INI syntax highlighting for `.properties` and `.toml` files
 - [security] update xterm.js to 3.9.2
 
diff --git a/packages/plugin-ext/src/api/plugin-api.ts b/packages/plugin-ext/src/api/plugin-api.ts
index d94b56f9e1024..fef0c0dea0a43 100644
--- a/packages/plugin-ext/src/api/plugin-api.ts
+++ b/packages/plugin-ext/src/api/plugin-api.ts
@@ -1028,6 +1028,7 @@ export interface TasksExt {
     $provideTasks(handle: number): Promise<TaskDto[] | undefined>;
     $resolveTask(handle: number, task: TaskDto): Promise<TaskDto | undefined>;
     $onDidStartTask(execution: TaskExecutionDto): void;
+    $onDidEndTask(id: number): void;
 }
 
 export interface TasksMain {
diff --git a/packages/plugin-ext/src/main/browser/tasks-main.ts b/packages/plugin-ext/src/main/browser/tasks-main.ts
index 2bf61347a3d0a..a1b7384879776 100644
--- a/packages/plugin-ext/src/main/browser/tasks-main.ts
+++ b/packages/plugin-ext/src/main/browser/tasks-main.ts
@@ -24,7 +24,7 @@ import { DisposableCollection } from '@theia/core';
 import { TaskProviderRegistry, TaskResolverRegistry, TaskProvider, TaskResolver } from '@theia/task/lib/browser/task-contribution';
 import { interfaces } from 'inversify';
 import { WorkspaceService } from '@theia/workspace/lib/browser/workspace-service';
-import { TaskInfo } from '@theia/task/lib/common/task-protocol';
+import { TaskInfo, TaskExitedEvent } from '@theia/task/lib/common/task-protocol';
 import { TaskWatcher } from '@theia/task/lib/common/task-watcher';
 import { TaskService } from '@theia/task/lib/browser/task-service';
 import { TaskConfiguration } from '@theia/task/lib/common';
@@ -63,6 +63,12 @@ export class TasksMainImpl implements TasksMain {
                 });
             }
         });
+
+        this.taskWatcher.onTaskExit((event: TaskExitedEvent) => {
+            if (event.ctx === this.workspaceRootUri) {
+                this.proxy.$onDidEndTask(event.taskId);
+            }
+        });
     }
 
     $registerTaskProvider(handle: number, type: string): void {
diff --git a/packages/plugin-ext/src/plugin/plugin-context.ts b/packages/plugin-ext/src/plugin/plugin-context.ts
index afd89fdffa1ef..a923c2cddd054 100644
--- a/packages/plugin-ext/src/plugin/plugin-context.ts
+++ b/packages/plugin-ext/src/plugin/plugin-context.ts
@@ -582,6 +582,10 @@ export function createAPIFactory(
 
             onDidStartTask(listener, thisArg?, disposables?) {
                 return tasksExt.onDidStartTask(listener, thisArg, disposables);
+            },
+
+            onDidEndTask(listener, thisArg?, disposables?) {
+                return tasksExt.onDidEndTask(listener, thisArg, disposables);
             }
         };
 
diff --git a/packages/plugin-ext/src/plugin/tasks/tasks.ts b/packages/plugin-ext/src/plugin/tasks/tasks.ts
index 0cb4cdb90c5c5..80b818bf63383 100644
--- a/packages/plugin-ext/src/plugin/tasks/tasks.ts
+++ b/packages/plugin-ext/src/plugin/tasks/tasks.ts
@@ -36,6 +36,7 @@ export class TasksExtImpl implements TasksExt {
     private taskExecutions = new Map<number, theia.TaskExecution>();
 
     private readonly onDidExecuteTask: Emitter<theia.TaskStartEvent> = new Emitter<theia.TaskStartEvent>();
+    private readonly onDidTerminateTask: Emitter<theia.TaskEndEvent> = new Emitter<theia.TaskEndEvent>();
 
     constructor(rpc: RPCProtocol) {
         this.proxy = rpc.getProxy(PLUGIN_RPC_CONTEXT.TASKS_MAIN);
@@ -51,6 +52,23 @@ export class TasksExtImpl implements TasksExt {
         });
     }
 
+    get onDidEndTask(): Event<theia.TaskEndEvent> {
+        return this.onDidTerminateTask.event;
+    }
+
+    $onDidEndTask(id: number): void {
+        const taskExecution = this.taskExecutions.get(id);
+        if (!taskExecution) {
+            throw new Error(`Task execution with id ${id} is not found`);
+        }
+
+        this.taskExecutions.delete(id);
+
+        this.onDidTerminateTask.fire({
+            execution: taskExecution
+        });
+    }
+
     registerTaskProvider(type: string, provider: theia.TaskProvider): theia.Disposable {
         const callId = this.addNewAdapter(new TaskProviderAdapter(provider));
         this.proxy.$registerTaskProvider(callId, type);
diff --git a/packages/plugin/src/theia.d.ts b/packages/plugin/src/theia.d.ts
index d6213085204f4..97d9302e900ca 100644
--- a/packages/plugin/src/theia.d.ts
+++ b/packages/plugin/src/theia.d.ts
@@ -7001,6 +7001,18 @@ declare module '@theia/plugin' {
         execution: TaskExecution;
     }
 
+    /**
+     * An event signaling the end of an executed task.
+     *
+     * This interface is not intended to be implemented.
+     */
+    interface TaskEndEvent {
+        /**
+         * The task item representing the task that finished.
+         */
+        execution: TaskExecution;
+    }
+
     export namespace tasks {
 
         /**
@@ -7014,6 +7026,9 @@ declare module '@theia/plugin' {
 
         /** Fires when a task starts. */
         export const onDidStartTask: Event<TaskStartEvent>;
+
+        /** Fires when a task ends. */
+        export const onDidEndTask: Event<TaskEndEvent>;
     }
 
     /**