diff --git a/app/code/Magento/Captcha/Test/Unit/Observer/CheckUserForgotPasswordBackendObserverTest.php b/app/code/Magento/Captcha/Test/Unit/Observer/CheckUserForgotPasswordBackendObserverTest.php
new file mode 100644
index 0000000000000..584e7eb2e215f
--- /dev/null
+++ b/app/code/Magento/Captcha/Test/Unit/Observer/CheckUserForgotPasswordBackendObserverTest.php
@@ -0,0 +1,230 @@
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+
+declare(strict_types=1);
+
+namespace Magento\Captcha\Test\Unit\Observer;
+
+use Magento\Captcha\Helper\Data as DataHelper;
+use Magento\Captcha\Model\CaptchaInterface;
+use Magento\Captcha\Observer\CaptchaStringResolver;
+use Magento\Captcha\Observer\CheckUserForgotPasswordBackendObserver;
+use Magento\Framework\App\Action\Action;
+use Magento\Framework\App\ActionFlag;
+use Magento\Framework\App\Request\Http as HttpRequest;
+use Magento\Framework\App\Response\Http as HttpResponse;
+use Magento\Framework\Event\Observer;
+use Magento\Framework\Message\ManagerInterface;
+use Magento\Framework\Session\SessionManagerInterface;
+use Magento\Framework\TestFramework\Unit\Helper\ObjectManager as ObjectManagerHelper;
+use PHPUnit\Framework\MockObject\MockObject;
+use PHPUnit\Framework\TestCase;
+
+/**
+ * Unit Test for \Magento\Captcha\Observer\CheckUserForgotPasswordBackendObserver
+ * @SuppressWarnings(PHPMD.CouplingBetweenObjects)
+ */
+class CheckUserForgotPasswordBackendObserverTest extends TestCase
+{
+    const STUB_EMAIL = 'stub@test.mail';
+    const STUB_REQUEST_PARAMS = ['STUB_PARAM'];
+
+    /**
+     * @var MockObject|DataHelper
+     */
+    private $helperMock;
+
+    /**
+     * @var MockObject|CaptchaStringResolver
+     */
+    private $captchaStringResolverMock;
+
+    /**
+     * @var MockObject|SessionManagerInterface
+     */
+    private $sessionMock;
+
+    /**
+     * @var MockObject|ActionFlag
+     */
+    private $actionFlagMock;
+
+    /**
+     * @var MockObject|ManagerInterface
+     */
+    private $messageManagerMock;
+
+    /**
+     * @var CheckUserForgotPasswordBackendObserver
+     */
+    private $observer;
+
+    /**
+     * @var MockObject|CaptchaInterface
+     */
+    private $captchaMock;
+
+    /**
+     * @var MockObject|Observer
+     */
+    private $eventObserverMock;
+
+    /**
+     * @var MockObject|Action
+     */
+    private $controllerMock;
+
+    /**
+     * @var MockObject|HttpResponse
+     */
+    private $httpResponseMock;
+
+    /**
+     * @var MockObject|HttpRequest
+     */
+    private $requestMock;
+
+    /**
+     * @inheritDoc
+     */
+    protected function setUp()
+    {
+        $formId = 'backend_forgotpassword';
+
+        $this->helperMock = $this->createMock(DataHelper::class);
+        $this->captchaStringResolverMock = $this->createMock(CaptchaStringResolver::class);
+        $this->sessionMock = $this->getMockBuilder(SessionManagerInterface::class)
+            ->setMethods(['setEmail'])
+            ->getMockForAbstractClass();
+        $this->actionFlagMock = $this->createMock(ActionFlag::class);
+        $this->messageManagerMock = $this->createMock(ManagerInterface::class);
+
+        $objectManager = new ObjectManagerHelper($this);
+        $this->observer = $objectManager->getObject(
+            CheckUserForgotPasswordBackendObserver::class,
+            [
+                '_helper' => $this->helperMock,
+                'captchaStringResolver' => $this->captchaStringResolverMock,
+                '_session' => $this->sessionMock,
+                '_actionFlag' => $this->actionFlagMock,
+                'messageManager' => $this->messageManagerMock
+            ]
+        );
+
+        $this->captchaMock = $this->getMockBuilder(CaptchaInterface::class)
+            ->setMethods(['isRequired', 'isCorrect'])
+            ->getMockForAbstractClass();
+        $this->helperMock->expects($this->once())
+            ->method('getCaptcha')
+            ->with($formId)
+            ->willReturn($this->captchaMock);
+
+        $this->requestMock = $this->createMock(HttpRequest::class);
+        $this->httpResponseMock = $this->createMock(HttpResponse::class);
+
+        $this->controllerMock = $this->getMockBuilder(Action::class)
+            ->disableOriginalConstructor()
+            ->setMethods(['getUrl', 'getRequest', 'getResponse'])
+            ->getMockForAbstractClass();
+        $this->controllerMock->expects($this->any())
+            ->method('getRequest')
+            ->willReturn($this->requestMock);
+        $this->controllerMock->expects($this->any())
+            ->method('getResponse')
+            ->willReturn($this->httpResponseMock);
+
+        $this->eventObserverMock = $this->createPartialMock(Observer::class, ['getControllerAction']);
+        $this->eventObserverMock->expects($this->any())
+            ->method('getControllerAction')
+            ->willReturn($this->controllerMock);
+    }
+
+    /**
+     * Test case when Captcha is required and was entered correctly.
+     */
+    public function testExecuteWhenCaptchaIsCorrect()
+    {
+        $this->configureRequestMockWithStubValues();
+        $this->captchaMock->expects($this->once())->method('isRequired')->willReturn(true);
+        $this->captchaMock->expects($this->once())->method('isCorrect')->willReturn(true);
+
+        $this->executeOriginalMethodExpectsNoError();
+    }
+
+    /**
+     * Test case when Captcha is required and was entered incorrectly.
+     */
+    public function testExecuteWhenCaptchaIsIncorrect()
+    {
+        $this->configureRequestMockWithStubValues();
+        $this->captchaMock->expects($this->once())->method('isRequired')->willReturn(true);
+        $this->captchaMock->expects($this->once())->method('isCorrect')->willReturn(false);
+
+        $this->sessionMock->expects($this->once())->method('setEmail');
+        $this->actionFlagMock->expects($this->once())->method('set');
+        $this->controllerMock->expects($this->once())->method('getUrl');
+        $this->messageManagerMock->expects($this->once())
+            ->method('addErrorMessage')
+            ->with(__('Incorrect CAPTCHA'));
+        $this->httpResponseMock->expects($this->once())->method('setRedirect')->willReturnSelf();
+
+        $this->observer->execute($this->eventObserverMock);
+    }
+
+    /**
+     * Test case when Captcha is not required.
+     */
+    public function testExecuteWhenCaptchaIsNotRequired()
+    {
+        $this->configureRequestMockWithStubValues();
+        $this->captchaMock->expects($this->once())->method('isRequired')->willReturn(false);
+
+        $this->executeOriginalMethodExpectsNoError();
+    }
+
+    /**
+     * Test case when email is not provided
+     */
+    public function testExecuteWhenEmailParamIsNotPresent()
+    {
+        $this->requestMock->expects($this->any())
+            ->method('getParam')
+            ->with('email')
+            ->willReturn(null);
+        $this->requestMock->expects($this->any())
+            ->method('getParams')
+            ->willReturn(self::STUB_REQUEST_PARAMS);
+        $this->captchaMock->expects($this->never())->method('isRequired');
+        $this->captchaMock->expects($this->never())->method('isCorrect');
+
+        $this->executeOriginalMethodExpectsNoError();
+    }
+
+    /**
+     * Stub params for Request Mock
+     */
+    private function configureRequestMockWithStubValues()
+    {
+        $this->requestMock->expects($this->any())
+            ->method('getParam')
+            ->with('email')
+            ->willReturn(self::STUB_EMAIL);
+        $this->requestMock->expects($this->any())
+            ->method('getParams')
+            ->willReturn(self::STUB_REQUEST_PARAMS);
+    }
+
+    /**
+     * Run original method, expect there is no error
+     */
+    private function executeOriginalMethodExpectsNoError()
+    {
+        $this->messageManagerMock->expects($this->never())->method('addErrorMessage');
+        $this->httpResponseMock->expects($this->never())->method('setRedirect');
+
+        $this->observer->execute($this->eventObserverMock);
+    }
+}