diff --git a/src/main/java/org/gitlab4j/api/UserApi.java b/src/main/java/org/gitlab4j/api/UserApi.java
index 9a7076eb..6f7de604 100644
--- a/src/main/java/org/gitlab4j/api/UserApi.java
+++ b/src/main/java/org/gitlab4j/api/UserApi.java
@@ -1381,4 +1381,36 @@ public Pager<Membership> getMemberships(Long userId, int itemsPerPage) throws Gi
         GitLabApiForm formData = new GitLabApiForm();
         return (new Pager<>(this, Membership.class, itemsPerPage, formData.asMap(), "users", userId, "memberships"));
     }
+
+    /**
+     * Activates the given user (admin only)
+     *
+     * <pre><code>GitLab Endpoint: POST /users/:id/activate</code></pre>
+     *
+     * @param userId the ID of the user to activate
+     * @throws GitLabApiException if any exception occurs.
+     * @since GitLab 12.4
+     */
+    public void activateUser(Long userId) throws GitLabApiException {
+        if (userId == null) {
+            throw new RuntimeException("userId cannot be null");
+        }
+        post(Response.Status.CREATED, (Form) null, "users", userId, "activate");
+    }
+
+    /**
+     * Deactivates the given user (admin only)
+     *
+     * <pre><code>GitLab Endpoint: POST /users/:id/deactivate</code></pre>
+     *
+     * @param userId the ID of the user to deactivate
+     * @throws GitLabApiException if any exception occurs.
+     * @since GitLab 12.4
+     */
+    public void deactivateUser(Long userId) throws GitLabApiException {
+        if (userId == null) {
+            throw new RuntimeException("userId cannot be null");
+        }
+        post(Response.Status.CREATED, (Form) null, "users", userId, "deactivate");
+    }
 }
diff --git a/src/test/java/org/gitlab4j/api/PropertyConstants.java b/src/test/java/org/gitlab4j/api/PropertyConstants.java
index 6081d990..a302cd85 100644
--- a/src/test/java/org/gitlab4j/api/PropertyConstants.java
+++ b/src/test/java/org/gitlab4j/api/PropertyConstants.java
@@ -9,6 +9,7 @@ public interface PropertyConstants {
     String ADMIN_USERNAME_KEY = "TEST_ADMIN_USERNAME";
     String ACCESS_TOKEN_KEY = "TEST_ACCESS_TOKEN";
     String BLOCK_USERNAME_KEY = "TEST_BLOCK_USERNAME";
+    String DEACTIVATE_USERNAME_KEY = "TEST_DEACTIVATE_USERNAME";
     String GROUP_KEY = "TEST_GROUP";
     String GROUP_MEMBER_USERNAME_KEY = "TEST_GROUP_MEMBER_USERNAME";
     String GROUP_PROJECT_KEY = "TEST_GROUP_PROJECT";
diff --git a/src/test/java/org/gitlab4j/api/TestUserApi.java b/src/test/java/org/gitlab4j/api/TestUserApi.java
index 3ce6d062..6d17f3ea 100644
--- a/src/test/java/org/gitlab4j/api/TestUserApi.java
+++ b/src/test/java/org/gitlab4j/api/TestUserApi.java
@@ -59,6 +59,8 @@ public class TestUserApi extends AbstractIntegrationTest {
     // The following needs to be set to your test repository
     private static final String TEST_USERNAME = HelperUtils.getProperty(USERNAME_KEY);
     private static final String TEST_BLOCK_USERNAME = HelperUtils.getProperty(BLOCK_USERNAME_KEY);
+
+    private static final String TEST_DEACTIVATE_USERNAME = HelperUtils.getProperty(DEACTIVATE_USERNAME_KEY);
     private static final String TEST_SUDO_AS_USERNAME = HelperUtils.getProperty(SUDO_AS_USERNAME_KEY);
 
     private static final String TEST_IMPERSONATION_TOKEN_NAME = "ipt_1";
@@ -130,6 +132,8 @@ public class TestUserApi extends AbstractIntegrationTest {
     private static GitLabApi gitLabApi;
     private static User blockUser;
 
+    private static User deactivateUser;
+
     public TestUserApi() {
         super();
     }
@@ -167,6 +171,16 @@ public static void setup() {
                     } catch (Exception ignore) {}
                 }
 
+                if (TEST_DEACTIVATE_USERNAME != null) {
+                    try {
+                        deactivateUser = gitLabApi.getUserApi().getUser(TEST_DEACTIVATE_USERNAME);
+                        if (deactivateUser != null) {
+                            gitLabApi.getUserApi().unblockUser(deactivateUser.getId());
+                        }
+                    } catch (Exception ignore) {}
+                }
+
+
                 if (TEST_SSH_KEY != null) {
                     try {
                         List<SshKey> sshKeys = gitLabApi.getUserApi().getSshKeys();
@@ -237,6 +251,20 @@ public void testBlockUnblockUser() throws GitLabApiException {
         assertNotEquals("blocked", user.getState());
     }
 
+    @Test
+    public void testActivateDeactivateUser() throws GitLabApiException {
+        assumeTrue(deactivateUser != null);
+
+        assertNotEquals("deactivated", deactivateUser.getState());
+        gitLabApi.getUserApi().deactivateUser(deactivateUser.getId());
+        User user = gitLabApi.getUserApi().getUser(deactivateUser.getId());
+        assertEquals("deactivated", user.getState());
+
+        gitLabApi.getUserApi().activateUser(deactivateUser.getId());
+        user = gitLabApi.getUserApi().getUser(deactivateUser.getId());
+        assertNotEquals("deactivated", user.getState());
+    }
+
     @Test
     public void testGetOptionalUser() throws GitLabApiException {
 
diff --git a/src/test/resources/test-gitlab4j.properties b/src/test/resources/test-gitlab4j.properties
index c16b4d3f..ee117a20 100644
--- a/src/test/resources/test-gitlab4j.properties
+++ b/src/test/resources/test-gitlab4j.properties
@@ -34,6 +34,7 @@ TEST_USERNAME=gitlab4j
 # it will be created during integration testing
 TEST_SUDO_AS_USERNAME=user1
 TEST_BLOCK_USERNAME=user1
+TEST_DEACTIVATE_USERNAME=user1
 TEST_XFER_NAMESPACE=user1
 TEST_REQUEST_ACCESS_USERNAME=user1