diff --git a/src/vs/workbench/api/browser/mainThreadSCM.ts b/src/vs/workbench/api/browser/mainThreadSCM.ts
index 3cb6a499c8c..5ac8c935667 100644
--- a/src/vs/workbench/api/browser/mainThreadSCM.ts
+++ b/src/vs/workbench/api/browser/mainThreadSCM.ts
@@ -421,6 +421,16 @@ export class MainThreadSCM implements MainThreadSCMShape {
 		repository.input.placeholder = placeholder;
 	}
 
+	$setInputBoxEnablement(sourceControlHandle: number, enabled: boolean): void {
+		const repository = this._repositories.get(sourceControlHandle);
+
+		if (!repository) {
+			return;
+		}
+
+		repository.input.enabled = enabled;
+	}
+
 	$setInputBoxVisibility(sourceControlHandle: number, visible: boolean): void {
 		const repository = this._repositories.get(sourceControlHandle);
 
diff --git a/src/vs/workbench/api/common/extHost.protocol.ts b/src/vs/workbench/api/common/extHost.protocol.ts
index 33fcc3fb351..c7ebcd110f8 100644
--- a/src/vs/workbench/api/common/extHost.protocol.ts
+++ b/src/vs/workbench/api/common/extHost.protocol.ts
@@ -1187,6 +1187,7 @@ export interface MainThreadSCMShape extends IDisposable {
 
 	$setInputBoxValue(sourceControlHandle: number, value: string): void;
 	$setInputBoxPlaceholder(sourceControlHandle: number, placeholder: string): void;
+	$setInputBoxEnablement(sourceControlHandle: number, enabled: boolean): void;
 	$setInputBoxVisibility(sourceControlHandle: number, visible: boolean): void;
 	$showValidationMessage(sourceControlHandle: number, message: string | IMarkdownString, type: InputValidationType): void;
 	$setValidationProviderIsEnabled(sourceControlHandle: number, enabled: boolean): void;
diff --git a/src/vs/workbench/api/common/extHostSCM.ts b/src/vs/workbench/api/common/extHostSCM.ts
index 49a54bc71fe..b65c52714b0 100644
--- a/src/vs/workbench/api/common/extHostSCM.ts
+++ b/src/vs/workbench/api/common/extHostSCM.ts
@@ -249,6 +249,25 @@ export class ExtHostSCMInputBox implements vscode.SourceControlInputBox {
 		this.#proxy.$setValidationProviderIsEnabled(this._sourceControlHandle, !!fn);
 	}
 
+	private _enabled: boolean = true;
+
+	get enabled(): boolean {
+		checkProposedApiEnabled(this._extension, 'scmInput');
+		return this._enabled;
+	}
+
+	set enabled(enabled: boolean) {
+		checkProposedApiEnabled(this._extension, 'scmInput');
+		enabled = !!enabled;
+
+		if (this._enabled === enabled) {
+			return;
+		}
+
+		this._enabled = enabled;
+		this.#proxy.$setInputBoxEnablement(this._sourceControlHandle, enabled);
+	}
+
 	private _visible: boolean = true;
 
 	get visible(): boolean {
diff --git a/src/vs/workbench/contrib/scm/browser/scmViewPane.ts b/src/vs/workbench/contrib/scm/browser/scmViewPane.ts
index a3059234eb1..53c6abecef4 100644
--- a/src/vs/workbench/contrib/scm/browser/scmViewPane.ts
+++ b/src/vs/workbench/contrib/scm/browser/scmViewPane.ts
@@ -1862,6 +1862,13 @@ class SCMInputWidget extends Disposable {
 		this.repositoryDisposables.add(input.repository.provider.onDidChangeCommitTemplate(updateTemplate, this));
 		updateTemplate();
 
+		// Update input enablement
+		const updateEnablement = (enabled: boolean) => {
+			this.inputEditor.updateOptions({ readOnly: enabled });
+		};
+		this.repositoryDisposables.add(input.onDidChangeEnablement(enabled => updateEnablement(enabled)));
+		updateEnablement(input.enabled);
+
 		// Save model
 		this.model = { input, textModel };
 	}
diff --git a/src/vs/workbench/contrib/scm/common/scm.ts b/src/vs/workbench/contrib/scm/common/scm.ts
index e180e8e9d3c..9d18d25a131 100644
--- a/src/vs/workbench/contrib/scm/common/scm.ts
+++ b/src/vs/workbench/contrib/scm/common/scm.ts
@@ -121,6 +121,9 @@ export interface ISCMInput {
 	validateInput: IInputValidator;
 	readonly onDidChangeValidateInput: Event<void>;
 
+	enabled: boolean;
+	readonly onDidChangeEnablement: Event<boolean>;
+
 	visible: boolean;
 	readonly onDidChangeVisibility: Event<boolean>;
 
diff --git a/src/vs/workbench/contrib/scm/common/scmService.ts b/src/vs/workbench/contrib/scm/common/scmService.ts
index 7877ba1d34e..73da6c00923 100644
--- a/src/vs/workbench/contrib/scm/common/scmService.ts
+++ b/src/vs/workbench/contrib/scm/common/scmService.ts
@@ -38,6 +38,20 @@ class SCMInput implements ISCMInput {
 	private readonly _onDidChangePlaceholder = new Emitter<string>();
 	readonly onDidChangePlaceholder: Event<string> = this._onDidChangePlaceholder.event;
 
+	private _enabled = true;
+
+	get enabled(): boolean {
+		return this._enabled;
+	}
+
+	set enabled(enabled: boolean) {
+		this._enabled = enabled;
+		this._onDidChangeEnablement.fire(enabled);
+	}
+
+	private readonly _onDidChangeEnablement = new Emitter<boolean>();
+	readonly onDidChangeEnablement: Event<boolean> = this._onDidChangeEnablement.event;
+
 	private _visible = true;
 
 	get visible(): boolean {
diff --git a/src/vs/workbench/services/extensions/common/extensionsApiProposals.ts b/src/vs/workbench/services/extensions/common/extensionsApiProposals.ts
index 99311836683..3c4bf725a84 100644
--- a/src/vs/workbench/services/extensions/common/extensionsApiProposals.ts
+++ b/src/vs/workbench/services/extensions/common/extensionsApiProposals.ts
@@ -46,6 +46,7 @@ export const allApiProposals = Object.freeze({
 	quickPickSortByLabel: 'https://raw.githubusercontent.com/microsoft/vscode/main/src/vscode-dts/vscode.proposed.quickPickSortByLabel.d.ts',
 	resolvers: 'https://raw.githubusercontent.com/microsoft/vscode/main/src/vscode-dts/vscode.proposed.resolvers.d.ts',
 	scmActionButton: 'https://raw.githubusercontent.com/microsoft/vscode/main/src/vscode-dts/vscode.proposed.scmActionButton.d.ts',
+	scmInput: 'https://raw.githubusercontent.com/microsoft/vscode/main/src/vscode-dts/vscode.proposed.scmInput.d.ts',
 	scmSelectedProvider: 'https://raw.githubusercontent.com/microsoft/vscode/main/src/vscode-dts/vscode.proposed.scmSelectedProvider.d.ts',
 	scmValidation: 'https://raw.githubusercontent.com/microsoft/vscode/main/src/vscode-dts/vscode.proposed.scmValidation.d.ts',
 	taskPresentationGroup: 'https://raw.githubusercontent.com/microsoft/vscode/main/src/vscode-dts/vscode.proposed.taskPresentationGroup.d.ts',
diff --git a/src/vscode-dts/vscode.proposed.scmInput.d.ts b/src/vscode-dts/vscode.proposed.scmInput.d.ts
new file mode 100644
index 00000000000..6efdb57ae45
--- /dev/null
+++ b/src/vscode-dts/vscode.proposed.scmInput.d.ts
@@ -0,0 +1,20 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the MIT License. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+declare module 'vscode' {
+
+	// https://github.com/microsoft/vscode/issues/150268
+
+	/**
+	 * Represents the input box in the Source Control viewlet.
+	 */
+	export interface SourceControlInputBox {
+
+		/**
+		 * Controls whether the input box is enabled (default is `true`).
+		 */
+		enabled: boolean;
+	}
+}