diff --git a/app/routes/organizations/api-client-id.js b/app/routes/organizations/api-client-id.js
index 58b40ed2..f49afde9 100644
--- a/app/routes/organizations/api-client-id.js
+++ b/app/routes/organizations/api-client-id.js
@@ -1,4 +1,12 @@
 import Route from '@ember/routing/route';
+import { inject as service } from '@ember/service';
 
 export default class OrganizationsRegisterRoute extends Route {
-}
\ No newline at end of file
+  @service('config-service') configService;
+
+  model() {
+    return {
+      registrationPaused: this.configService.CLIENT_ID_REGISTRATION_PAUSED,
+    };
+  }
+}
diff --git a/app/services/config-service.js b/app/services/config-service.js
index 81c2f127..96b72a47 100644
--- a/app/services/config-service.js
+++ b/app/services/config-service.js
@@ -2,5 +2,6 @@ import Service from '@ember/service';
 import config from '../config/environment';
 
 export default Service.extend({
-  API_URL: config.API_URL
+  API_URL: config.API_URL,
+  CLIENT_ID_REGISTRATION_PAUSED: config.CLIENT_ID_REGISTRATION_PAUSED
 });
\ No newline at end of file
diff --git a/app/styles/app.scss b/app/styles/app.scss
index 641322e3..5a6c529e 100644
--- a/app/styles/app.scss
+++ b/app/styles/app.scss
@@ -212,4 +212,18 @@ $desktop-width: 1024px;
 #clear-button {
 	background-color:$dark-grey;
 	color:$light-grey !important;
+}
+
+.alert-warning {
+	color: $black;
+
+	a {
+		color: $black;
+		text-decoration: underline;
+
+		&:hover,
+		&:focus {
+			color: $black;
+		}
+	}
 }
\ No newline at end of file
diff --git a/app/templates/organizations/api-client-id.hbs b/app/templates/organizations/api-client-id.hbs
index bac7c1b1..1dec6dba 100644
--- a/app/templates/organizations/api-client-id.hbs
+++ b/app/templates/organizations/api-client-id.hbs
@@ -6,7 +6,9 @@
       <div class="info-text">
         <p>ROR API users are encouraged to register for a client ID and to include it in the header of API requests. Requests that include a header named client-id with a valid client ID as its value will receive a rate limit of 2,000 requests/5min. API requests that don't include a client ID will receive a rate limit of 50 requests/5min.</p>
         
-        <p>Please complete the form below to register for a ROR API client ID. Your client ID will be sent to the email address you provide.</p>
+        {{#unless this.model.registrationPaused}}
+          <p>Please complete the form below to register for a ROR API client ID. Your client ID will be sent to the email address you provide.</p>
+        {{/unless}}
 
         <h2 class="h3">A few notes about ROR API client IDs:</h2>
         <ul>
@@ -16,10 +18,22 @@
           <li>For additional help obtaining or using a ROR API client ID contact <a href="mailto:support@ror.org">support@ror.org</a></li>
         </ul>
       </div>
+
+      {{#if this.model.registrationPaused}}
+        <BsAlert @dismissible={{false}} @type="warning">
+          <h2 class="alert-heading h5">Client ID registration is temporarily paused</h2>
+          <p>We've paused new ROR API client ID registrations while we make updates to the service. No rate limits
+            are currently enforced based on the presence or absence of a client ID, and none will be introduced before
+            registration is restored, so API usage is not affected by this pause.</p>
+          <p class="mb-0">
+            If you have questions or an urgent request, please contact <a href="mailto:support@ror.org">support@ror.org</a>.
+            Thanks for your patience!
+          </p>
+        </BsAlert>
+      {{else}}
+        <Organizations::ApiClientRegistrationForm />
+      {{/if}}
     </div>
   </div>
 </div>
-<div class="container">
-  <Organizations::ApiClientRegistrationForm />
-</div>
 
diff --git a/config/environment.js b/config/environment.js
index 05974657..3578d1b7 100644
--- a/config/environment.js
+++ b/config/environment.js
@@ -20,6 +20,7 @@ module.exports = function(environment) {
     },
 
     API_URL: process.env.API_URL || "https://api.ror.org/v2",
+    CLIENT_ID_REGISTRATION_PAUSED: true,
     BASE_URL: process.env.BASE_URL || null,
     SENTRY_DSN: process.env.SENTRY_DSN || null,
     VERSION: pkg.version,
diff --git a/tests/acceptance/a11y/api-client-test.js b/tests/acceptance/a11y/api-client-test.js
index 9f32b4cb..82790969 100644
--- a/tests/acceptance/a11y/api-client-test.js
+++ b/tests/acceptance/a11y/api-client-test.js
@@ -6,9 +6,17 @@ import a11yAudit from 'ember-a11y-testing/test-support/audit';
 module('Acceptance | a11y | api-client-id', function (hooks) {
   setupApplicationTest(hooks);
 
-  test('the API client registration page has no axe violations', async function (assert) {
+  test('the API client registration page has no axe violations when paused', async function (assert) {
+    this.owner.lookup('service:config-service').set('CLIENT_ID_REGISTRATION_PAUSED', true);
     await visit('/api-client-id');
     await a11yAudit();
-    assert.ok(true, 'no axe violations on /api-client-id');
+    assert.ok(true, 'no axe violations on /api-client-id when paused');
+  });
+
+  test('the API client registration page has no axe violations when registration is open', async function (assert) {
+    this.owner.lookup('service:config-service').set('CLIENT_ID_REGISTRATION_PAUSED', false);
+    await visit('/api-client-id');
+    await a11yAudit();
+    assert.ok(true, 'no axe violations on /api-client-id when registration is open');
   });
 });
diff --git a/tests/acceptance/api-client-id-test.js b/tests/acceptance/api-client-id-test.js
new file mode 100644
index 00000000..031e167f
--- /dev/null
+++ b/tests/acceptance/api-client-id-test.js
@@ -0,0 +1,28 @@
+import { module, test } from 'qunit';
+import { setupApplicationTest } from 'ember-qunit';
+import { visit } from '@ember/test-helpers';
+
+module('Acceptance | api-client-id', function (hooks) {
+  setupApplicationTest(hooks);
+
+  test('when registration is paused, the banner is shown and the form is not rendered', async function (assert) {
+    this.owner.lookup('service:config-service').set('CLIENT_ID_REGISTRATION_PAUSED', true);
+
+    await visit('/api-client-id');
+
+    assert.dom('.alert-warning').exists('paused banner is rendered');
+    assert.dom('.alert-warning').includesText('Client ID registration is temporarily paused');
+    assert.dom('.api-client-registration-form').doesNotExist('registration form is not rendered when paused');
+    assert.dom('button[type="submit"]').doesNotExist('submit button is not rendered when paused');
+  });
+
+  test('when registration is not paused, the form is rendered and the banner is not shown', async function (assert) {
+    this.owner.lookup('service:config-service').set('CLIENT_ID_REGISTRATION_PAUSED', false);
+
+    await visit('/api-client-id');
+
+    assert.dom('.alert-warning').doesNotExist('paused banner is not rendered');
+    assert.dom('.api-client-registration-form').exists('registration form is rendered');
+    assert.dom('button[type="submit"]').exists('submit button is rendered');
+  });
+});
diff --git a/tests/test-helper.js b/tests/test-helper.js
index 0382a848..d33c1ee7 100644
--- a/tests/test-helper.js
+++ b/tests/test-helper.js
@@ -1,8 +1,12 @@
 import Application from '../app';
 import config from '../config/environment';
+import * as QUnit from 'qunit';
 import { setApplication } from '@ember/test-helpers';
+import { setup } from 'qunit-dom';
 import { start } from 'ember-qunit';
 
 setApplication(Application.create(config.APP));
 
+setup(QUnit.assert);
+
 start();