diff --git a/back/src/adapters/primary/routers/admin/createAdminRouter.ts b/back/src/adapters/primary/routers/admin/createAdminRouter.ts
index 996183a12f..bee8c62c62 100644
--- a/back/src/adapters/primary/routers/admin/createAdminRouter.ts
+++ b/back/src/adapters/primary/routers/admin/createAdminRouter.ts
@@ -82,6 +82,17 @@ export const createAdminRouter = (deps: AppDependencies): Router => {
       ),
   );
 
+  sharedAdminRouter.addUserForAgency(
+    deps.inclusionConnectAuthMiddleware,
+    (req, res) =>
+      sendHttpResponse(req, res.status(201), () =>
+        deps.useCases.updateIcUserRoleForAgency.execute(
+          req.body,
+          req.payloads?.currentUser,
+        ),
+      ),
+  );
+
   sharedAdminRouter.rejectIcUserForAgency(
     deps.inclusionConnectAuthMiddleware,
     (req, res) =>
diff --git a/back/src/domains/inclusion-connected-users/use-cases/CreateUserForAgency.ts b/back/src/domains/inclusion-connected-users/use-cases/CreateUserForAgency.ts
new file mode 100644
index 0000000000..2cdbe04487
--- /dev/null
+++ b/back/src/domains/inclusion-connected-users/use-cases/CreateUserForAgency.ts
@@ -0,0 +1,65 @@
+import {
+  AgencyRight,
+  InclusionConnectedUser,
+  UserCreateParamsForAgency,
+  errors,
+  userCreateParamsForAgencySchema,
+} from "shared";
+import { createTransactionalUseCase } from "../../core/UseCase";
+import { TimeGateway } from "../../core/time-gateway/ports/TimeGateway";
+import { UuidGenerator } from "../../core/uuid-generator/ports/UuidGenerator";
+import { throwIfNotAdmin } from "../helpers/throwIfIcUserNotBackofficeAdmin";
+
+export type CreateUserForAgency = ReturnType<typeof makeCreateUserForAgency>;
+
+export const makeCreateUserForAgency = createTransactionalUseCase<
+  UserCreateParamsForAgency,
+  void,
+  InclusionConnectedUser,
+  { timeGateway: TimeGateway; uuidGenerator: UuidGenerator }
+>(
+  {
+    name: "CreateUserForAgency",
+    inputSchema: userCreateParamsForAgencySchema,
+  },
+  async ({
+    inputParams: { agencyId, email, isNotifiedByEmail, roles, userId },
+    uow,
+    currentUser,
+    deps,
+  }) => {
+    throwIfNotAdmin(currentUser);
+    const agency = await uow.agencyRepository.getById(agencyId);
+    if (!agency) throw errors.agency.notFound({ agencyId });
+
+    if (agency.refersToAgencyId && roles.includes("validator"))
+      throw errors.agency.invalidRoleUpdateForAgencyWithRefersTo({
+        agencyId: agency.id,
+        role: "validator",
+      });
+
+    const existingUser = await uow.userRepository.getById(userId);
+
+    if (!existingUser) {
+      await uow.userRepository.save({
+        createdAt: deps.timeGateway.now().toISOString(),
+        email,
+        externalId: null,
+        firstName: "",
+        id: userId,
+        lastName: "",
+      });
+    }
+
+    const existingUserAgencyRights = existingUser?.agencyRights ?? [];
+    const agencyRight: AgencyRight = {
+      roles,
+      isNotifiedByEmail: isNotifiedByEmail,
+      agency,
+    };
+    await uow.userRepository.updateAgencyRights({
+      userId: userId,
+      agencyRights: [...existingUserAgencyRights, agencyRight],
+    });
+  },
+);
diff --git a/back/src/domains/inclusion-connected-users/use-cases/CreateUserForAgency.unit.test.ts b/back/src/domains/inclusion-connected-users/use-cases/CreateUserForAgency.unit.test.ts
new file mode 100644
index 0000000000..013188f4e5
--- /dev/null
+++ b/back/src/domains/inclusion-connected-users/use-cases/CreateUserForAgency.unit.test.ts
@@ -0,0 +1,234 @@
+import {
+  AgencyDtoBuilder,
+  InclusionConnectedUserBuilder,
+  errors,
+  expectPromiseToFailWithError,
+  expectToEqual,
+} from "shared";
+import { InMemoryAgencyRepository } from "../../agency/adapters/InMemoryAgencyRepository";
+import { InMemoryUserRepository } from "../../core/authentication/inclusion-connect/adapters/InMemoryUserRepository";
+import { CustomTimeGateway } from "../../core/time-gateway/adapters/CustomTimeGateway";
+import { TimeGateway } from "../../core/time-gateway/ports/TimeGateway";
+import { InMemoryUowPerformer } from "../../core/unit-of-work/adapters/InMemoryUowPerformer";
+import { createInMemoryUow } from "../../core/unit-of-work/adapters/createInMemoryUow";
+import { TestUuidGenerator } from "../../core/uuid-generator/adapters/UuidGeneratorImplementations";
+import { UuidGenerator } from "../../core/uuid-generator/ports/UuidGenerator";
+import {
+  CreateUserForAgency,
+  makeCreateUserForAgency,
+} from "./CreateUserForAgency";
+
+const backofficeAdminUser = new InclusionConnectedUserBuilder()
+  .withId("backoffice-admin-id")
+  .withIsAdmin(true)
+  .build();
+
+const notAdminUser = new InclusionConnectedUserBuilder()
+  .withId("not-admin-id")
+  .withIsAdmin(false)
+  .build();
+
+const agency = new AgencyDtoBuilder()
+  .withCounsellorEmails(["fake-email@gmail.com"])
+  .build();
+
+describe("CreateUserForAgency", () => {
+  let createUserForAgency: CreateUserForAgency;
+  let uowPerformer: InMemoryUowPerformer;
+  let userRepository: InMemoryUserRepository;
+  let agencyRepository: InMemoryAgencyRepository;
+  let timeGateway: TimeGateway;
+  let uuidGenerator: UuidGenerator;
+
+  beforeEach(() => {
+    const uow = createInMemoryUow();
+
+    userRepository = uow.userRepository;
+    agencyRepository = uow.agencyRepository;
+    uowPerformer = new InMemoryUowPerformer(uow);
+    userRepository.setInclusionConnectedUsers([
+      backofficeAdminUser,
+      notAdminUser,
+    ]);
+    timeGateway = new CustomTimeGateway();
+    uuidGenerator = new TestUuidGenerator();
+    createUserForAgency = makeCreateUserForAgency({
+      uowPerformer,
+      deps: { timeGateway, uuidGenerator },
+    });
+    agencyRepository.setAgencies([agency]);
+  });
+
+  it("throws Forbidden if token payload is not backoffice token", async () => {
+    await expectPromiseToFailWithError(
+      createUserForAgency.execute(
+        {
+          userId: uuidGenerator.new(),
+          roles: ["counsellor"],
+          agencyId: "agency-1",
+          isNotifiedByEmail: true,
+          email: "any@email.fr",
+        },
+        notAdminUser,
+      ),
+      errors.user.forbidden({ userId: notAdminUser.id }),
+    );
+  });
+
+  it("throws not found if agency does not exist", async () => {
+    userRepository.setInclusionConnectedUsers([
+      backofficeAdminUser,
+      {
+        ...notAdminUser,
+        agencyRights: [],
+        dashboards: {
+          agencies: {},
+          establishments: {},
+        },
+      },
+    ]);
+
+    const agencyId = "Fake-Agency-Id";
+
+    await expectPromiseToFailWithError(
+      createUserForAgency.execute(
+        {
+          userId: uuidGenerator.new(),
+          roles: ["counsellor"],
+          agencyId,
+          isNotifiedByEmail: true,
+          email: "notAdminUser@email.fr",
+        },
+        backofficeAdminUser,
+      ),
+      errors.agency.notFound({
+        agencyId,
+      }),
+    );
+  });
+
+  describe("Agency with refers to agency", () => {
+    const agencyWithRefersTo = new AgencyDtoBuilder()
+      .withId("agency-with-refers-to")
+      .withValidatorEmails([])
+      .withCounsellorEmails(["fake-counsellor-email@gmail.com"])
+      .withRefersToAgencyId(agency.id)
+      .build();
+
+    it("Throw when user have role validator", async () => {
+      agencyRepository.insert(agencyWithRefersTo);
+
+      expectPromiseToFailWithError(
+        createUserForAgency.execute(
+          {
+            userId: uuidGenerator.new(),
+            agencyId: agencyWithRefersTo.id,
+            roles: ["validator"],
+            isNotifiedByEmail: true,
+            email: "new-user@email.fr",
+          },
+          backofficeAdminUser,
+        ),
+        errors.agency.invalidRoleUpdateForAgencyWithRefersTo({
+          agencyId: agencyWithRefersTo.id,
+          role: "validator",
+        }),
+      );
+    });
+  });
+
+  it("create new user with its agency rights", async () => {
+    const newUserId = uuidGenerator.new();
+    userRepository.users = [];
+
+    await createUserForAgency.execute(
+      {
+        userId: newUserId,
+        agencyId: agency.id,
+        roles: ["counsellor"],
+        isNotifiedByEmail: false,
+        email: "new-user@email.fr",
+      },
+      backofficeAdminUser,
+    );
+
+    expect(userRepository.users.length).toBe(1);
+    expectToEqual(await userRepository.getById(newUserId), {
+      createdAt: timeGateway.now().toISOString(),
+      externalId: null,
+      firstName: "",
+      id: newUserId,
+      email: "new-user@email.fr",
+      lastName: "",
+      agencyRights: [
+        { agency, isNotifiedByEmail: false, roles: ["counsellor"] },
+      ],
+      dashboards: {
+        agencies: {},
+        establishments: {},
+      },
+    });
+  });
+
+  it("add agency rights to an existing user", async () => {
+    const anotherAgency = new AgencyDtoBuilder()
+      .withId("another-agency-id")
+      .build();
+    await agencyRepository.insert(anotherAgency);
+    const userId = uuidGenerator.new();
+    await userRepository.save({
+      id: userId,
+      email: "user@email.fr",
+      firstName: "John",
+      lastName: "Doe",
+      externalId: null,
+      createdAt: timeGateway.now().toISOString(),
+    });
+    await userRepository.updateAgencyRights({
+      userId,
+      agencyRights: [
+        {
+          agency,
+          isNotifiedByEmail: true,
+          roles: ["validator"],
+        },
+      ],
+    });
+
+    await createUserForAgency.execute(
+      {
+        userId,
+        agencyId: anotherAgency.id,
+        roles: ["counsellor"],
+        isNotifiedByEmail: false,
+        email: "user@email.fr",
+      },
+      backofficeAdminUser,
+    );
+
+    expectToEqual(await userRepository.getById(userId), {
+      createdAt: timeGateway.now().toISOString(),
+      externalId: null,
+      firstName: "John",
+      id: userId,
+      email: "user@email.fr",
+      lastName: "Doe",
+      agencyRights: [
+        {
+          agency,
+          isNotifiedByEmail: true,
+          roles: ["validator"],
+        },
+        {
+          agency: anotherAgency,
+          isNotifiedByEmail: false,
+          roles: ["counsellor"],
+        },
+      ],
+      dashboards: {
+        agencies: {},
+        establishments: {},
+      },
+    });
+  });
+});
diff --git a/shared/src/admin/admin.dto.ts b/shared/src/admin/admin.dto.ts
index 8b5e1a457b..1388ac4314 100644
--- a/shared/src/admin/admin.dto.ts
+++ b/shared/src/admin/admin.dto.ts
@@ -20,6 +20,10 @@ export type UserUpdateParamsForAgency = {
   email: Email | null;
 };
 
+export type UserCreateParamsForAgency = UserUpdateParamsForAgency & {
+  email: Email;
+};
+
 export type RejectIcUserRoleForAgencyParams = OmitFromExistingKeys<
   UserUpdateParamsForAgency,
   "roles" | "isNotifiedByEmail" | "email"
diff --git a/shared/src/admin/admin.routes.ts b/shared/src/admin/admin.routes.ts
index baecca5653..4cda193118 100644
--- a/shared/src/admin/admin.routes.ts
+++ b/shared/src/admin/admin.routes.ts
@@ -59,6 +59,20 @@ export const adminRoutes = defineRoutes({
       404: httpErrorSchema,
     },
   }),
+
+  addUserForAgency: defineRoute({
+    method: "post",
+    url: "/admin/inclusion-connected/users",
+    requestBodySchema: userUpdateParamsForAgencySchema,
+    ...withAuthorizationHeaders,
+    responses: {
+      201: expressEmptyResponseBody,
+      400: httpErrorSchema,
+      401: httpErrorSchema,
+      404: httpErrorSchema,
+    },
+  }),
+
   rejectIcUserForAgency: defineRoute({
     method: "delete",
     url: "/admin/inclusion-connected/users",
diff --git a/shared/src/admin/admin.schema.ts b/shared/src/admin/admin.schema.ts
index 4ee19ce128..19b5666923 100644
--- a/shared/src/admin/admin.schema.ts
+++ b/shared/src/admin/admin.schema.ts
@@ -12,6 +12,7 @@ import {
   ManageConventionAdminForm,
   ManageEstablishmentAdminForm,
   RejectIcUserRoleForAgencyParams,
+  UserCreateParamsForAgency,
   UserUpdateParamsForAgency,
   WithUserFilters,
 } from "./admin.dto";
@@ -25,6 +26,15 @@ export const userUpdateParamsForAgencySchema: z.Schema<UserUpdateParamsForAgency
     email: emailSchema.or(z.null()),
   });
 
+export const userCreateParamsForAgencySchema: z.Schema<UserCreateParamsForAgency> =
+  z.object({
+    userId: userIdSchema,
+    agencyId: agencyIdSchema,
+    roles: z.array(agencyRoleSchema),
+    isNotifiedByEmail: z.boolean(),
+    email: emailSchema,
+  });
+
 export const rejectIcUserRoleForAgencyParamsSchema: z.Schema<RejectIcUserRoleForAgencyParams> =
   z.object({
     agencyId: agencyIdSchema,
diff --git a/shared/src/errors/errors.ts b/shared/src/errors/errors.ts
index 6ff97cac90..6a89f00921 100644
--- a/shared/src/errors/errors.ts
+++ b/shared/src/errors/errors.ts
@@ -288,6 +288,14 @@ export const errors = {
       new BadRequestError(
         `Le role "${role}" n'est pas autorisé pour l'agence "${agencyId}" car cette agence n'a qu'une seul étape de validation.`,
       ),
+
+    invalidRoleUpdateForAgencyWithRefersTo: ({
+      agencyId,
+      role,
+    }: { agencyId: AgencyId; role: AgencyRole }) =>
+      new BadRequestError(
+        `Le role "${role}" n'est pas autorisé pour l'agence "${agencyId}" car cette agence est une structure d'accompagnement.`,
+      ),
   },
   user: {
     unauthorized: () => new UnauthorizedError(),