diff --git a/src/vs/vscode.proposed.d.ts b/src/vs/vscode.proposed.d.ts
index ecb3c0d89f4..86f4775bc2f 100644
--- a/src/vs/vscode.proposed.d.ts
+++ b/src/vs/vscode.proposed.d.ts
@@ -2255,5 +2255,17 @@ declare module 'vscode' {
 	}
 
 
+	//#endregion
+
+	//#region https://github.com/microsoft/vscode/issues/105667
+
+	export interface TreeView<T> {
+		/**
+		 * An optional human-readable description that will be rendered in the title of the view.
+		 * Setting the title description to null, undefined, or empty string will remove the title description from the view.
+		 */
+		titleDescription?: string | undefined;
+	}
+
 	//#endregion
 }
diff --git a/src/vs/workbench/api/browser/mainThreadTreeViews.ts b/src/vs/workbench/api/browser/mainThreadTreeViews.ts
index 3d62a4a9e89..a0430755b1d 100644
--- a/src/vs/workbench/api/browser/mainThreadTreeViews.ts
+++ b/src/vs/workbench/api/browser/mainThreadTreeViews.ts
@@ -86,12 +86,13 @@ export class MainThreadTreeViews extends Disposable implements MainThreadTreeVie
 		}
 	}
 
-	$setTitle(treeViewId: string, title: string): void {
-		this.logService.trace('MainThreadTreeViews#$setTitle', treeViewId, title);
+	$setTitle(treeViewId: string, title: string, titleDescription: string | undefined): void {
+		this.logService.trace('MainThreadTreeViews#$setTitle', treeViewId, title, titleDescription);
 
 		const viewer = this.getTreeView(treeViewId);
 		if (viewer) {
 			viewer.title = title;
+			viewer.titleDescription = titleDescription;
 		}
 	}
 
diff --git a/src/vs/workbench/api/common/extHost.protocol.ts b/src/vs/workbench/api/common/extHost.protocol.ts
index b6d085fc7ad..8d9856c7040 100644
--- a/src/vs/workbench/api/common/extHost.protocol.ts
+++ b/src/vs/workbench/api/common/extHost.protocol.ts
@@ -288,7 +288,7 @@ export interface MainThreadTreeViewsShape extends IDisposable {
 	$refresh(treeViewId: string, itemsToRefresh?: { [treeItemHandle: string]: ITreeItem; }): Promise<void>;
 	$reveal(treeViewId: string, treeItem: ITreeItem, parentChain: ITreeItem[], options: IRevealOptions): Promise<void>;
 	$setMessage(treeViewId: string, message: string): void;
-	$setTitle(treeViewId: string, title: string): void;
+	$setTitle(treeViewId: string, title: string, titleDescription: string | undefined): void;
 }
 
 export interface MainThreadDownloadServiceShape extends IDisposable {
diff --git a/src/vs/workbench/api/common/extHostTreeViews.ts b/src/vs/workbench/api/common/extHostTreeViews.ts
index 8621743e706..813bcbc8263 100644
--- a/src/vs/workbench/api/common/extHostTreeViews.ts
+++ b/src/vs/workbench/api/common/extHostTreeViews.ts
@@ -101,6 +101,14 @@ export class ExtHostTreeViews implements ExtHostTreeViewsShape {
 			set title(title: string) {
 				treeView.title = title;
 			},
+			get titleDescription() {
+				checkProposedApiEnabled(extension);
+				return treeView.titleDescription;
+			},
+			set titleDescription(titleDescription: string | undefined) {
+				checkProposedApiEnabled(extension);
+				treeView.titleDescription = titleDescription;
+			},
 			reveal: (element: T, options?: IRevealOptions): Promise<void> => {
 				return treeView.reveal(element, options);
 			},
@@ -318,7 +326,17 @@ class ExtHostTreeView<T> extends Disposable {
 
 	set title(title: string) {
 		this._title = title;
-		this.proxy.$setTitle(this.viewId, title);
+		this.proxy.$setTitle(this.viewId, title, this._titleDescription);
+	}
+
+	private _titleDescription: string | undefined;
+	get titleDescription(): string | undefined {
+		return this._titleDescription;
+	}
+
+	set titleDescription(titleDescription: string | undefined) {
+		this._titleDescription = titleDescription;
+		this.proxy.$setTitle(this.viewId, this._title, titleDescription);
 	}
 
 	setExpanded(treeItemHandle: TreeItemHandle, expanded: boolean): void {
diff --git a/src/vs/workbench/browser/parts/views/treeView.ts b/src/vs/workbench/browser/parts/views/treeView.ts
index 6077addea83..dc4116973b5 100644
--- a/src/vs/workbench/browser/parts/views/treeView.ts
+++ b/src/vs/workbench/browser/parts/views/treeView.ts
@@ -39,6 +39,7 @@ export class TreeViewPane extends ViewPane {
 		this.treeView = treeView;
 		this._register(this.treeView.onDidChangeActions(() => this.updateActions(), this));
 		this._register(this.treeView.onDidChangeTitle((newTitle) => this.updateTitle(newTitle)));
+		this._register(this.treeView.onDidChangeTitleDescription((newTitleDescription) => this.updateTitleDescription(newTitleDescription)));
 		this._register(toDisposable(() => this.treeView.setVisibility(false)));
 		this._register(this.onDidChangeBodyVisibility(() => this.updateTreeVisibility()));
 		this._register(this.treeView.onDidChangeWelcomeState(() => this._onDidChangeViewWelcomeState.fire()));
diff --git a/src/vs/workbench/common/views.ts b/src/vs/workbench/common/views.ts
index e50bd99f313..8951daa7984 100644
--- a/src/vs/workbench/common/views.ts
+++ b/src/vs/workbench/common/views.ts
@@ -554,6 +554,8 @@ export interface ITreeView extends IDisposable {
 
 	title: string;
 
+	titleDescription: string | undefined;
+
 	readonly visible: boolean;
 
 	readonly onDidExpandItem: Event<ITreeItem>;
@@ -568,6 +570,8 @@ export interface ITreeView extends IDisposable {
 
 	readonly onDidChangeTitle: Event<string>;
 
+	readonly onDidChangeTitleDescription: Event<string | undefined>;
+
 	readonly onDidChangeWelcomeState: Event<void>;
 
 	refresh(treeItems?: ITreeItem[]): Promise<void>;
diff --git a/src/vs/workbench/contrib/views/browser/treeView.ts b/src/vs/workbench/contrib/views/browser/treeView.ts
index 89b629fc0c6..bb149747841 100644
--- a/src/vs/workbench/contrib/views/browser/treeView.ts
+++ b/src/vs/workbench/contrib/views/browser/treeView.ts
@@ -100,6 +100,9 @@ export class TreeView extends Disposable implements ITreeView {
 	private readonly _onDidChangeTitle: Emitter<string> = this._register(new Emitter<string>());
 	readonly onDidChangeTitle: Event<string> = this._onDidChangeTitle.event;
 
+	private readonly _onDidChangeTitleDescription: Emitter<string | undefined> = this._register(new Emitter<string | undefined>());
+	readonly onDidChangeTitleDescription: Event<string | undefined> = this._onDidChangeTitleDescription.event;
+
 	private readonly _onDidCompleteRefresh: Emitter<void> = this._register(new Emitter<void>());
 
 	constructor(
@@ -220,6 +223,16 @@ export class TreeView extends Disposable implements ITreeView {
 		this._onDidChangeTitle.fire(this._title);
 	}
 
+	private _titleDescription: string | undefined;
+	get titleDescription(): string | undefined {
+		return this._titleDescription;
+	}
+
+	set titleDescription(description: string | undefined) {
+		this._titleDescription = description;
+		this._onDidChangeTitleDescription.fire(this._titleDescription);
+	}
+
 	get canSelectMany(): boolean {
 		return this._canSelectMany;
 	}