diff --git a/back/src/domains/inclusion-connected-users/use-cases/RemoveUserFromAgency.ts b/back/src/domains/inclusion-connected-users/use-cases/RemoveUserFromAgency.ts
index f62e4729e..dfab9ef32 100644
--- a/back/src/domains/inclusion-connected-users/use-cases/RemoveUserFromAgency.ts
+++ b/back/src/domains/inclusion-connected-users/use-cases/RemoveUserFromAgency.ts
@@ -1,6 +1,6 @@
 import {
-  AgencyDto,
   AgencyId,
+  AgencyRight,
   InclusionConnectedUser,
   OAuthGatewayProvider,
   RemoveAgencyUserParams,
@@ -33,7 +33,7 @@ const getUserAndThrowIfNotFound = async (
 const getUserAgencyRightsAndThrowIfUserHasNoAgencyRight = (
   user: InclusionConnectedUser,
   agencyId: AgencyId,
-): AgencyDto => {
+): AgencyRight => {
   const userRight = user.agencyRights.find(
     (agencyRight) => agencyRight.agency.id === agencyId,
   );
@@ -44,7 +44,17 @@ const getUserAgencyRightsAndThrowIfUserHasNoAgencyRight = (
       userId: user.id,
     });
 
-  return userRight.agency;
+  return userRight;
+};
+
+const throwIfUserIsValidatorAndAgencyHasRefersTo = (
+  agencyRight: AgencyRight,
+) => {
+  const agency = agencyRight.agency;
+
+  if (agency.refersToAgencyId && agencyRight.roles.includes("validator")) {
+    throw errors.agency.invalidUserRemovalWhenAgencyWithRefersTo(agency.id);
+  }
 };
 
 export const makeRemoveUserFromAgency = createTransactionalUseCase<
@@ -64,10 +74,13 @@ export const makeRemoveUserFromAgency = createTransactionalUseCase<
       inputParams.userId,
       provider,
     );
-    const agency = getUserAgencyRightsAndThrowIfUserHasNoAgencyRight(
+    const agencyRight = getUserAgencyRightsAndThrowIfUserHasNoAgencyRight(
       requestedUser,
       inputParams.agencyId,
     );
+    const agency = agencyRight.agency;
+
+    throwIfUserIsValidatorAndAgencyHasRefersTo(agencyRight);
     await throwIfAgencyDontHaveOtherValidatorsReceivingNotifications(
       uow,
       agency,
diff --git a/back/src/domains/inclusion-connected-users/use-cases/RemoveUserFromAgency.unit.test.ts b/back/src/domains/inclusion-connected-users/use-cases/RemoveUserFromAgency.unit.test.ts
index ac7d216d1..d981829de 100644
--- a/back/src/domains/inclusion-connected-users/use-cases/RemoveUserFromAgency.unit.test.ts
+++ b/back/src/domains/inclusion-connected-users/use-cases/RemoveUserFromAgency.unit.test.ts
@@ -94,24 +94,17 @@ describe("RemoveUserFromAgency", () => {
     );
   });
 
-  it("throws forbidden if user to delete has not rights on agency", async () => {
-    const inputParams: RemoveAgencyUserParams = {
-      agencyId: agency.id,
-      userId: notAdminUser.id,
-    };
-
-    expectPromiseToFailWithError(
-      removeUserFromAgency.execute(inputParams, backofficeAdminUser),
-      errors.user.expectedRightsOnAgency(inputParams),
-    );
-  });
-
-  it("throws forbidden if user to delete is the last validator receiving notifications", async () => {
+  it("throws bad request if user attempts to delete validator when agency has refersTo", async () => {
+    const agencyWithRefersTo = new AgencyDtoBuilder()
+      .withId("agency-with-refers-to-id")
+      .withRefersToAgencyId(agency.id)
+      .withCounsellorEmails([notAdminUser.email])
+      .build();
     const initialAgencyRights: AgencyRight[] = [
       {
-        agency,
+        agency: agencyWithRefersTo,
         roles: ["validator"],
-        isNotifiedByEmail: true,
+        isNotifiedByEmail: false,
       },
     ];
     const user: InclusionConnectedUser = {
@@ -122,7 +115,23 @@ describe("RemoveUserFromAgency", () => {
         establishments: {},
       },
     };
+    agencyRepository.insert(agencyWithRefersTo);
     userRepository.setInclusionConnectedUsers([user]);
+
+    const inputParams: RemoveAgencyUserParams = {
+      agencyId: agencyWithRefersTo.id,
+      userId: user.id,
+    };
+
+    expectPromiseToFailWithError(
+      removeUserFromAgency.execute(inputParams, backofficeAdminUser),
+      errors.agency.invalidUserRemovalWhenAgencyWithRefersTo(
+        agencyWithRefersTo.id,
+      ),
+    );
+  });
+
+  it("throws forbidden if user to delete has not rights on agency", async () => {
     const inputParams: RemoveAgencyUserParams = {
       agencyId: agency.id,
       userId: notAdminUser.id,
@@ -130,7 +139,7 @@ describe("RemoveUserFromAgency", () => {
 
     expectPromiseToFailWithError(
       removeUserFromAgency.execute(inputParams, backofficeAdminUser),
-      errors.agency.notEnoughValidators(inputParams),
+      errors.user.expectedRightsOnAgency(inputParams),
     );
   });
 
@@ -173,7 +182,7 @@ describe("RemoveUserFromAgency", () => {
     const initialAgencyRights: AgencyRight[] = [
       {
         agency: agencyWithRefersTo,
-        roles: ["validator"],
+        roles: ["counsellor"],
         isNotifiedByEmail: true,
       },
     ];
diff --git a/front/src/app/components/agency/AgencyUsers.tsx b/front/src/app/components/agency/AgencyUsers.tsx
index 71cbe1382..3eda5a5cf 100644
--- a/front/src/app/components/agency/AgencyUsers.tsx
+++ b/front/src/app/components/agency/AgencyUsers.tsx
@@ -172,6 +172,11 @@ export const AgencyUsers = ({ agency }: AgencyUsersProperties) => {
               {
                 children: "Supprimer",
                 priority: "secondary",
+                disabled:
+                  agency.refersToAgencyId !== null &&
+                  agencyUser.agencyRights[agency.id].roles[0].includes(
+                    "validator",
+                  ),
                 id: `${domElementIds.admin.agencyTab.editAgencyRemoveUserButton}-${agency.id}-${index}`,
                 onClick: () => {
                   dispatch(feedbackSlice.actions.clearFeedbacksTriggered());
diff --git a/shared/src/errors/errors.ts b/shared/src/errors/errors.ts
index ec17e0d61..698f764dc 100644
--- a/shared/src/errors/errors.ts
+++ b/shared/src/errors/errors.ts
@@ -309,6 +309,11 @@ export const errors = {
       new BadRequestError(
         `Le role "${role}" n'est pas autorisé pour l'agence "${agencyId}" car cette agence est une structure d'accompagnement.`,
       ),
+
+    invalidUserRemovalWhenAgencyWithRefersTo: (agencyId: AgencyId) =>
+      new BadRequestError(
+        `La suppression d'un valideur n'est pas autorisée pour l'agence "${agencyId}" car cette agence est une structure d'accompagnement.`,
+      ),
   },
   user: {
     unauthorized: () => new UnauthorizedError(),