diff --git a/CHANGELOG.md b/CHANGELOG.md
index e18c2283c..e9664bdd1 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,6 +8,10 @@ and this project adheres to
 
 ## [Unreleased]
 
+### Added
+
+- 🧑‍💻(oidc) add ability to pull registration ID (e.g. SIRET) from OIDC #577
+
 ### Fixed
 
 - 🧑‍💻(user) fix the User.language infinite migration #611
diff --git a/docker/auth/realm.json b/docker/auth/realm.json
index f14d9e837..5d6bd381a 100644
--- a/docker/auth/realm.json
+++ b/docker/auth/realm.json
@@ -59,7 +59,7 @@
       "realmRoles": ["user"]
     },
     {
-      "username": "marie",
+      "username": "jean.marie",
       "email": "marie.varzy@gmail.com",
       "firstName": "Marie",
       "lastName": "Devarzy",
@@ -70,7 +70,7 @@
       "credentials": [
         {
           "type": "password",
-          "value": "people"
+          "value": "password-e2e-jean.marie"
         }
       ],
       "realmRoles": ["user"]
diff --git a/src/backend/core/api/client/serializers.py b/src/backend/core/api/client/serializers.py
index 9236b7833..df0410193 100644
--- a/src/backend/core/api/client/serializers.py
+++ b/src/backend/core/api/client/serializers.py
@@ -88,8 +88,8 @@ class UserOrganizationSerializer(serializers.ModelSerializer):
 
     class Meta:
         model = models.Organization
-        fields = ["id", "name"]
-        read_only_fields = ["id", "name"]
+        fields = ["id", "name", "registration_id_list"]
+        read_only_fields = ["id", "name", "registration_id_list"]
 
 
 class UserSerializer(DynamicFieldsModelSerializer):
diff --git a/src/backend/people/settings.py b/src/backend/people/settings.py
index 6c1bb41bd..f1f5e7a34 100755
--- a/src/backend/people/settings.py
+++ b/src/backend/people/settings.py
@@ -639,6 +639,8 @@ class Development(Base):
     # this is a dev credentials for mail provisioning API
     MAIL_PROVISIONING_API_CREDENTIALS = "bGFfcmVnaWU6cGFzc3dvcmQ="
 
+    OIDC_ORGANIZATION_REGISTRATION_ID_FIELD = "siret"
+
     def __init__(self):
         """In dev, force installs needed for Swagger API."""
         # pylint: disable=invalid-name
diff --git a/src/frontend/apps/e2e/__tests__/app-desk/siret.spec.ts b/src/frontend/apps/e2e/__tests__/app-desk/siret.spec.ts
new file mode 100644
index 000000000..6ce3bde44
--- /dev/null
+++ b/src/frontend/apps/e2e/__tests__/app-desk/siret.spec.ts
@@ -0,0 +1,23 @@
+import { expect, test } from '@playwright/test';
+
+import { keyCloakSignIn } from './common';
+
+test.beforeEach(async ({ page, browserName }) => {
+  await page.goto('/');
+  await keyCloakSignIn(page, browserName, 'marie');
+});
+
+test.describe('OIDC interop with SIRET', () => {
+  test('it checks the SIRET is displayed in /me endpoint', async ({
+    page,
+    browserName,
+  }) => {
+    const response = await page.request.get(
+      'http://localhost:8071/api/v1.0/users/me/',
+    );
+    expect(response.ok()).toBeTruthy();
+    expect(await response.json()).toMatchObject({
+      organization: { registration_id_list: ['21580304000017'] },
+    });
+  });
+});
\ No newline at end of file
diff --git a/src/helm/env.d/dev/values.desk.yaml.gotmpl b/src/helm/env.d/dev/values.desk.yaml.gotmpl
index fc5354233..eaac1d125 100644
--- a/src/helm/env.d/dev/values.desk.yaml.gotmpl
+++ b/src/helm/env.d/dev/values.desk.yaml.gotmpl
@@ -26,6 +26,7 @@ backend:
     OIDC_OP_TOKEN_ENDPOINT: https://fca.integ01.dev-agentconnect.fr/api/v2/token
     OIDC_OP_USER_ENDPOINT: https://fca.integ01.dev-agentconnect.fr/api/v2/userinfo
     OIDC_OP_LOGOUT_ENDPOINT: https://fca.integ01.dev-agentconnect.fr/api/v2/session/end
+    OIDC_ORGANIZATION_REGISTRATION_ID_FIELD: "siret"
     OIDC_RP_CLIENT_ID:
       secretKeyRef:
         name: backend