diff --git a/litellm/proxy/_types.py b/litellm/proxy/_types.py
index c549f48126e..acff771cf65 100644
--- a/litellm/proxy/_types.py
+++ b/litellm/proxy/_types.py
@@ -1711,6 +1711,18 @@ class NewUserRequest(GenerateRequestBase):
     sso_user_id: str | None = None
     organizations: list[str] | None = None
 
+    @model_validator(mode="before")
+    @classmethod
+    def _accept_singular_organization_id(cls, values: object) -> object:
+        if not isinstance(values, dict):
+            return values
+        organization_id: Final = values.get("organization_id")
+        current: Final = values.get("organizations")
+        organizations: Final[list[object]] = list(current) if isinstance(current, list) else []
+        if not isinstance(organization_id, str) or organization_id in organizations:
+            return values
+        return {**values, "organizations": [*organizations, organization_id]}
+
 
 class NewUserResponse(GenerateKeyResponse):
     max_budget: float | None = None
diff --git a/tests/test_litellm/proxy/test__types.py b/tests/test_litellm/proxy/test__types.py
index 26bb1533da4..2b6ab2a8b7c 100644
--- a/tests/test_litellm/proxy/test__types.py
+++ b/tests/test_litellm/proxy/test__types.py
@@ -10,6 +10,7 @@ from litellm.proxy._types import (
     LiteLLM_AuditLogs,
     LiteLLM_TeamMembership,
     LitellmUserRoles,
+    NewUserRequest,
     OrganizationMemberUpdateRequest,
     ResetSpendRequest,
     UpdateKeyRequest,
@@ -277,3 +278,32 @@ def test_team_membership_budget_table_present_still_works():
     }
     result = LiteLLM_TeamMembership.model_validate(data)
     assert result.litellm_budget_table is None
+
+
+def test_a_singular_organization_id_reaches_the_organizations_list():
+    request = NewUserRequest.model_validate({"user_email": "member@org.test", "organization_id": "org-1"})
+
+    assert request.organizations == ["org-1"]
+
+
+def test_a_singular_organization_id_is_merged_with_an_organizations_list():
+    request = NewUserRequest.model_validate(
+        {"user_email": "member@org.test", "organization_id": "org-2", "organizations": ["org-1"]}
+    )
+
+    assert request.organizations == ["org-1", "org-2"]
+
+
+def test_an_organization_named_both_ways_is_not_duplicated():
+    request = NewUserRequest.model_validate(
+        {"user_email": "member@org.test", "organization_id": "org-1", "organizations": ["org-1"]}
+    )
+
+    assert request.organizations == ["org-1"]
+
+
+@pytest.mark.parametrize("body", [{}, {"organization_id": None}])
+def test_a_request_without_an_organization_id_keeps_its_organizations_untouched(body):
+    request = NewUserRequest.model_validate({"user_email": "member@org.test", **body})
+
+    assert request.organizations is None
diff --git a/ui/litellm-dashboard/src/app/(dashboard)/users/_components/view_users.test.tsx b/ui/litellm-dashboard/src/app/(dashboard)/users/_components/view_users.test.tsx
index 095bdbf7250..22b6e8f849e 100644
--- a/ui/litellm-dashboard/src/app/(dashboard)/users/_components/view_users.test.tsx
+++ b/ui/litellm-dashboard/src/app/(dashboard)/users/_components/view_users.test.tsx
@@ -66,6 +66,25 @@ const makeUser = (userId: string, email: string) => ({
   budget_duration: null,
 });
 
+const session = vi.hoisted(() => ({
+  userId: "admin-user-id",
+  userRole: "Admin",
+  organizations: [] as unknown[],
+}));
+
+vi.mock("@/app/(dashboard)/hooks/useAuthorized", () => ({
+  default: () => ({
+    accessToken: "test-token",
+    token: "test-token",
+    userId: session.userId,
+    userRole: session.userRole,
+  }),
+}));
+
+vi.mock("@/app/(dashboard)/hooks/organizations/useOrganizations", () => ({
+  useOrganizations: () => ({ data: session.organizations }),
+}));
+
 const createQueryClient = () =>
   new QueryClient({
     defaultOptions: {
@@ -84,16 +103,21 @@ const defaultProps = {
   teams: [],
 };
 
-const renderDashboard = (overrides: Partial<typeof defaultProps> = {}) =>
-  renderWithProviders(
+const renderDashboard = (overrides: Partial<typeof defaultProps> = {}) => {
+  const props = { ...defaultProps, ...overrides };
+  session.userId = props.userID;
+  session.userRole = props.userRole;
+  return renderWithProviders(
     <QueryClientProvider client={createQueryClient()}>
-      <ViewUserDashboard {...defaultProps} {...overrides} />
+      <ViewUserDashboard {...props} />
     </QueryClientProvider>,
   );
+};
 
 describe("ViewUserDashboard", () => {
   beforeEach(() => {
     vi.clearAllMocks();
+    session.organizations = [];
     userListCall.mockResolvedValue({
       users: [makeUser("user-1", "test@example.com")],
       total: 1,
@@ -161,6 +185,29 @@ describe("ViewUserDashboard", () => {
     expect(screen.queryByRole("button", { name: /\+ bulk invite users/i })).not.toBeInTheDocument();
   });
 
+  it("shows the invite button to an org admin, whose session role is only Internal User", async () => {
+    session.organizations = [
+      { organization_id: "org-1", members: [{ user_id: "org-admin-user", user_role: "org_admin" }] },
+    ];
+
+    renderDashboard({ userRole: "Internal User", userID: "org-admin-user" });
+
+    expect(await screen.findByRole("button", { name: /\+ invite user/i })).toBeInTheDocument();
+    expect(screen.queryByRole("button", { name: /\+ bulk invite users/i })).not.toBeInTheDocument();
+    expect(screen.queryByTestId("toggle-user-selection")).not.toBeInTheDocument();
+  });
+
+  it("keeps the invite button hidden from a plain member of an organization", async () => {
+    session.organizations = [
+      { organization_id: "org-1", members: [{ user_id: "member-user", user_role: "internal_user" }] },
+    ];
+
+    renderDashboard({ userRole: "Internal User", userID: "member-user" });
+
+    expect(await screen.findByText("test@example.com")).toBeInTheDocument();
+    expect(screen.queryByRole("button", { name: /\+ invite user/i })).not.toBeInTheDocument();
+  });
+
   it("keeps actions unavailable while the user list is loading", () => {
     userListCall.mockReturnValue(new Promise(() => undefined));
 
diff --git a/ui/litellm-dashboard/src/app/(dashboard)/users/_components/view_users.tsx b/ui/litellm-dashboard/src/app/(dashboard)/users/_components/view_users.tsx
index 7a3133840be..39d333ad199 100644
--- a/ui/litellm-dashboard/src/app/(dashboard)/users/_components/view_users.tsx
+++ b/ui/litellm-dashboard/src/app/(dashboard)/users/_components/view_users.tsx
@@ -18,6 +18,7 @@ import OnboardingModal, { InvitationLink } from "@/components/onboarding_link";
 
 import { DEBOUNCE_WAIT_MS } from "@/utils/debounceConstants";
 import { isAdminRole, isProxyAdminRole } from "@/utils/roles";
+import useIsOrgAdmin from "@/app/(dashboard)/hooks/useIsOrgAdmin";
 import { useDebouncedValue } from "@tanstack/react-pacer/debouncer";
 import { useQuery, useQueryClient } from "@tanstack/react-query";
 import {
@@ -59,6 +60,7 @@ const ViewUserDashboard: React.FC<ViewUserDashboardProps> = ({
   orgAdminOrgIds,
 }) => {
   const isProxyAdmin = userRole ? isProxyAdminRole(userRole) : false;
+  const isOrgAdmin = useIsOrgAdmin();
   const queryClient = useQueryClient();
 
   const [pagination, setPagination] = useState<PaginationState>({ pageIndex: 0, pageSize: DEFAULT_PAGE_SIZE });
@@ -327,7 +329,7 @@ const ViewUserDashboard: React.FC<ViewUserDashboardProps> = ({
           )}
           {!userListQuery.isLoading && userID && accessToken && (
             <>
-              {isProxyAdmin && (
+              {(isProxyAdmin || isOrgAdmin) && (
                 <CreateUserButton userID={userID} accessToken={accessToken} possibleUIRoles={possibleUIRoles} />
               )}
 
diff --git a/ui/litellm-dashboard/src/components/CreateUserButton.test.tsx b/ui/litellm-dashboard/src/components/CreateUserButton.test.tsx
index 3777c46973f..3420812ec74 100644
--- a/ui/litellm-dashboard/src/components/CreateUserButton.test.tsx
+++ b/ui/litellm-dashboard/src/components/CreateUserButton.test.tsx
@@ -1,4 +1,4 @@
-import { render, screen, waitFor, within } from "@testing-library/react";
+import { fireEvent, render, screen, waitFor, within } from "@testing-library/react";
 import userEvent, { PointerEventsCheckLevel } from "@testing-library/user-event";
 import { QueryClient, QueryClientProvider } from "@tanstack/react-query";
 import { describe, it, expect, vi, beforeEach } from "vitest";
@@ -342,6 +342,54 @@ describe("CreateUserButton", () => {
       });
     });
 
+    it("preselects and posts the organization the caller administers", async () => {
+      const { useOrganizations } = await import("@/app/(dashboard)/hooks/organizations/useOrganizations");
+      vi.mocked(useOrganizations).mockReturnValue({
+        data: [
+          {
+            organization_id: "org-1",
+            organization_alias: "My Org",
+            members: [{ user_id: "123", user_role: "org_admin" }],
+          },
+          {
+            organization_id: "org-2",
+            organization_alias: "Someone Else's Org",
+            members: [{ user_id: "999", user_role: "org_admin" }],
+          },
+        ],
+        isLoading: false,
+      } as any);
+
+      const user = userEvent.setup({ pointerEventsCheck: PointerEventsCheckLevel.Never });
+      mockUserCreateCall.mockResolvedValue({ data: { user_id: "org-user" } });
+      mockInvitationCreateCall.mockResolvedValue({
+        id: "inv-preselect",
+        user_id: "org-user",
+        has_user_setup_sso: false,
+      } as any);
+
+      renderWithProviders(
+        <CreateUserButton {...defaultProps} possibleUIRoles={{ proxy_user: { ui_label: "User", description: "" } }} />,
+      );
+
+      await waitFor(() => {
+        expect(screen.getByRole("button", { name: /\+ invite user/i })).toBeInTheDocument();
+      });
+      await user.click(screen.getByRole("button", { name: /\+ invite user/i }));
+
+      const dialog = screen.getByRole("dialog", { name: /invite user/i });
+      fireEvent.change(within(dialog).getByLabelText(/user email/i), { target: { value: "member@example.com" } });
+      await user.click(within(dialog).getByRole("button", { name: /invite user/i }));
+
+      await waitFor(() => {
+        expect(mockUserCreateCall).toHaveBeenCalledWith(
+          "token",
+          null,
+          expect.objectContaining({ organizations: ["org-1"] }),
+        );
+      });
+    });
+
     it("should not call organizationMemberAddCall after user creation", async () => {
       const { useOrganizations } = await import("@/app/(dashboard)/hooks/organizations/useOrganizations");
       vi.mocked(useOrganizations).mockReturnValue({
diff --git a/ui/litellm-dashboard/src/components/CreateUserButton.tsx b/ui/litellm-dashboard/src/components/CreateUserButton.tsx
index e052a9e0818..87da06dd2e4 100644
--- a/ui/litellm-dashboard/src/components/CreateUserButton.tsx
+++ b/ui/litellm-dashboard/src/components/CreateUserButton.tsx
@@ -26,6 +26,7 @@ import {
   userCreateCall,
 } from "./networking";
 import OnboardingModal, { InvitationLink } from "./onboarding_link";
+import { orgsAdministeredBy } from "@/utils/roles";
 
 // Helper function to generate UUID compatible across all environments
 const generateUUID = (): string => {
@@ -170,6 +171,9 @@ export const CreateUserButton: React.FC<CreateuserProps> = ({
     label: `${org.organization_alias} (${org.organization_id})`,
     value: org.organization_id ?? "",
   }));
+  const administeredOrganizationIds = orgsAdministeredBy(organizations, userID)
+    .map((org) => org.organization_id)
+    .filter((id): id is string => Boolean(id));
 
   useEffect(() => {
     const fetchData = async () => {
@@ -193,6 +197,14 @@ export const CreateUserButton: React.FC<CreateuserProps> = ({
     fetchData();
   }, []);
 
+  const handleOpen = () => {
+    form.reset({
+      ...defaultValues,
+      organization_ids: administeredOrganizationIds.length > 0 ? administeredOrganizationIds : undefined,
+    });
+    setIsModalVisible(true);
+  };
+
   const handleCancel = () => {
     setIsModalVisible(false);
     setApiuser(false);
@@ -325,7 +337,7 @@ export const CreateUserButton: React.FC<CreateuserProps> = ({
   // Original return for standalone mode
   return (
     <>
-      <Button type="button" onClick={() => setIsModalVisible(true)}>
+      <Button type="button" onClick={handleOpen}>
         + Invite User
       </Button>
       <Dialog open={isModalVisible} onOpenChange={(open) => !open && handleCancel()}>
diff --git a/ui/litellm-dashboard/src/utils/roles.test.ts b/ui/litellm-dashboard/src/utils/roles.test.ts
index 0170d01d8e6..ed7c12f1d4e 100644
--- a/ui/litellm-dashboard/src/utils/roles.test.ts
+++ b/ui/litellm-dashboard/src/utils/roles.test.ts
@@ -6,6 +6,7 @@ import {
   isAdminRole,
   spendScopeUserId,
   isOrgAdminForAnyOrg,
+  orgsAdministeredBy,
   isOrgAdminSessionRole,
   isProxyAdminRole,
   isUserTeamAdminForAnyTeam,
@@ -192,6 +193,27 @@ describe("roles", () => {
     });
   });
 
+  describe("orgsAdministeredBy", () => {
+    const org = (organization_id: string, members: { user_id: string; user_role: string }[]): Organization =>
+      ({ organization_id, members }) as unknown as Organization;
+
+    it("returns only the organizations the user administers", () => {
+      const organizations = [
+        org("org-1", [{ user_id: "user-1", user_role: "internal_user" }]),
+        org("org-2", [{ user_id: "user-1", user_role: "org_admin" }]),
+        org("org-3", [{ user_id: "user-2", user_role: "org_admin" }]),
+      ];
+
+      expect(orgsAdministeredBy(organizations, "user-1").map((o) => o.organization_id)).toEqual(["org-2"]);
+    });
+
+    it("returns an empty list for missing organizations or a missing user id", () => {
+      expect(orgsAdministeredBy(null, "user-1")).toEqual([]);
+      expect(orgsAdministeredBy(undefined, "user-1")).toEqual([]);
+      expect(orgsAdministeredBy([org("org-1", [{ user_id: "user-1", user_role: "org_admin" }])], null)).toEqual([]);
+    });
+  });
+
   describe("isOrgAdminSessionRole", () => {
     it("accepts both the raw and the formatted org admin role", () => {
       expect(isOrgAdminSessionRole("org_admin")).toBe(true);
diff --git a/ui/litellm-dashboard/src/utils/roles.ts b/ui/litellm-dashboard/src/utils/roles.ts
index 62a5f02cc39..4ea81714904 100644
--- a/ui/litellm-dashboard/src/utils/roles.ts
+++ b/ui/litellm-dashboard/src/utils/roles.ts
@@ -46,19 +46,24 @@ export const isUserTeamAdminForSingleTeam = (teamMemberWithRoles: Member[] | nul
   return teamMemberWithRoles.some((member) => member.user_id === userID && member.role === "admin");
 };
 
-export const isOrgAdminForAnyOrg = (
+export const orgsAdministeredBy = (
   organizations: Organization[] | null | undefined,
   userID: string | null | undefined,
-): boolean => {
+): Organization[] => {
   if (organizations == null || !userID) {
-    return false;
+    return [];
   }
-  return organizations.some((org) => {
+  return organizations.filter((org) => {
     const members: OrganizationMembership[] = org.members ?? [];
     return members.some((member) => member.user_id === userID && member.user_role === ORG_ADMIN_MEMBERSHIP_ROLE);
   });
 };
 
+export const isOrgAdminForAnyOrg = (
+  organizations: Organization[] | null | undefined,
+  userID: string | null | undefined,
+): boolean => orgsAdministeredBy(organizations, userID).length > 0;
+
 export const formatUserRole = (userRole: string): string => {
   if (!userRole) {
     return "Undefined Role";