diff --git a/src/actions/sync_backend.js b/src/actions/sync_backend.js
index adb04bb7e..6a415f678 100644
--- a/src/actions/sync_backend.js
+++ b/src/actions/sync_backend.js
@@ -28,6 +28,7 @@ export const signOut = () => (dispatch, getState) => {
       break;
     case 'GitLab':
       persistField('gitLabProject', null);
+      persistField('gitLabHost', null);
       createGitlabOAuth().reset();
       break;
     default:
diff --git a/src/components/SyncServiceSignIn/index.js b/src/components/SyncServiceSignIn/index.js
index 487466a94..14b96c0c7 100644
--- a/src/components/SyncServiceSignIn/index.js
+++ b/src/components/SyncServiceSignIn/index.js
@@ -113,9 +113,10 @@ function GitLab() {
   const defaultProject = 'https://gitlab.com/your/project';
   const [project, setProject] = useState(defaultProject);
   const handleSubmit = (evt) => {
-    const projectId = gitLabProjectIdFromURL(project);
+    const [hostname, projectId] = gitLabProjectIdFromURL(project);
     if (projectId) {
       persistField('authenticatedSyncService', 'GitLab');
+      persistField('gitLabHost', hostname);
       persistField('gitLabProject', projectId);
       createGitlabOAuth().fetchAuthorizationCode();
     } else {
diff --git a/src/sync_backend_clients/gitlab_sync_backend_client.js b/src/sync_backend_clients/gitlab_sync_backend_client.js
index 92fefc7ee..13c518683 100644
--- a/src/sync_backend_clients/gitlab_sync_backend_client.js
+++ b/src/sync_backend_clients/gitlab_sync_backend_client.js
@@ -12,8 +12,8 @@ export const createGitlabOAuth = () => {
   let expiryPromise;
   let invalidGrantPromise;
   return new OAuth2AuthCodePKCE({
-    authorizationUrl: 'https://gitlab.com/oauth/authorize',
-    tokenUrl: 'https://gitlab.com/oauth/token',
+    authorizationUrl: `https://${getPersistedField('gitLabHost')}/oauth/authorize`,
+    tokenUrl: `https://${getPersistedField('gitLabHost')}/oauth/token`,
     clientId: process.env.REACT_APP_GITLAB_CLIENT_ID,
     redirectUrl: window.location.origin,
     scopes: ['api'],
@@ -64,8 +64,8 @@ export const gitLabProjectIdFromURL = (projectURL) => {
     // to a project. Reminder: a project path is not necessarily
     // /user/project because it may be under one or more groups such
     // as /user/group/subgroup/project.
-    if (url.hostname === 'gitlab.com' && path.split('/').length > 1) {
-      return encodeURIComponent(path);
+    if (path.split('/').length > 1) {
+      return [url.hostname, encodeURIComponent(path)];
     } else {
       return undefined;
     }
@@ -130,8 +130,6 @@ export const treeToDirectoryListing = (tree) => {
   );
 };
 
-const API_URL = 'https://gitlab.com/api/v4';
-
 /**
  * GitLab sync backend, implemented using their REST API.
  *
@@ -141,7 +139,9 @@ const API_URL = 'https://gitlab.com/api/v4';
 export default (oauthClient) => {
   const decoratedFetch = oauthClient.decorateFetchHTTPClient(fetch);
 
-  const getProjectApi = () => `${API_URL}/projects/${getPersistedField('gitLabProject')}`;
+  const getApiUrl = () => `https://${getPersistedField('gitLabHost')}/api/v4`;
+
+  const getProjectApi = () => `${getApiUrl()}/projects/${getPersistedField('gitLabProject')}`;
 
   const isSignedIn = async () => {
     if (!oauthClient.isAuthorized()) {
@@ -174,7 +174,7 @@ export default (oauthClient) => {
     // commit.
     const [userResponse, membersResponse] = await Promise.all([
       // https://docs.gitlab.com/ee/api/users.html#list-current-user-for-normal-users
-      decoratedFetch(`${API_URL}/user`),
+      decoratedFetch(`${getApiUrl()}/user`),
       // https://docs.gitlab.com/ee/api/members.html#list-all-members-of-a-group-or-project
       decoratedFetch(`${getProjectApi()}/members`),
     ]);
diff --git a/src/sync_backend_clients/gitlab_sync_backend_client.test.js b/src/sync_backend_clients/gitlab_sync_backend_client.test.js
index 24d285916..03c5faa57 100644
--- a/src/sync_backend_clients/gitlab_sync_backend_client.test.js
+++ b/src/sync_backend_clients/gitlab_sync_backend_client.test.js
@@ -7,9 +7,11 @@ import {
 
 test('Parses GitLab project from URL', () => {
   [
-    ['https://gitlab.com/user/foo', 'user%2Ffoo'],
-    ['https://gitlab.com/group/subgroup/project', 'group%2Fsubgroup%2Fproject'],
-    ['gitlab.com/foo/bar', 'foo%2Fbar'],
+    ['https://gitlab.com/user/foo', ['gitlab.com', 'user%2Ffoo']],
+    ['https://gitlab.com/group/subgroup/project', ['gitlab.com', 'group%2Fsubgroup%2Fproject']],
+    ['https://gitlab.example.com/user/foo', ['gitlab.example.com', 'user%2Ffoo']],
+    ['gitlab.com/foo/bar', ['gitlab.com', 'foo%2Fbar']],
+    ['gitlab.example.com/foo/bar', ['gitlab.example.com', 'foo%2Fbar']],
     ['gitlab.com/user-but-no-project', undefined],
     ['', undefined],
   ].forEach(([input, expected]) => {