diff --git a/app/(dashboard)/users/page.tsx b/app/(dashboard)/users/page.tsx
index dc2d389..ec607a1 100644
--- a/app/(dashboard)/users/page.tsx
+++ b/app/(dashboard)/users/page.tsx
@@ -16,6 +16,7 @@ import { useDataTable } from "@/hooks/use-data-table"
 import { usePermissions } from "@/hooks/use-permissions"
 import { UserNewForm } from "@/components/user/new-form"
 import { UserEditForm } from "@/components/user/edit-form"
+import { UserAddToGroupForm } from "@/components/user/add-to-group-form"
 import { useUsers } from "@/hooks/use-users"
 import { useDialog } from "@/lib/feedback/dialog"
 import { useMessage } from "@/lib/feedback/message"
@@ -64,6 +65,7 @@ export default function UsersPage() {
   const [searchTerm, setSearchTerm] = useState("")
   const [newFormOpen, setNewFormOpen] = useState(false)
   const [editFormOpen, setEditFormOpen] = useState(false)
+  const [addToGroupOpen, setAddToGroupOpen] = useState(false)
   const [editRow, setEditRow] = useState<UserRow | null>(null)
 
   const getDataList = React.useCallback(async () => {
@@ -212,7 +214,7 @@ export default function UsersPage() {
   }
 
   const addToGroup = () => {
-    message.error(t("Add to Group") + " - " + t("Coming soon"))
+    setAddToGroupOpen(true)
   }
 
   return (
@@ -269,6 +271,15 @@ export default function UsersPage() {
 
         <UserNewForm open={newFormOpen} onOpenChange={setNewFormOpen} onSuccess={getDataList} />
         <UserEditForm open={editFormOpen} onOpenChange={setEditFormOpen} row={editRow} onSuccess={getDataList} />
+        <UserAddToGroupForm
+          open={addToGroupOpen}
+          onOpenChange={setAddToGroupOpen}
+          selectedUsers={selectedKeys}
+          onSuccess={() => {
+            table.resetRowSelection()
+            getDataList()
+          }}
+        />
       </div>
     </Page>
   )
diff --git a/components/user/add-to-group-form.tsx b/components/user/add-to-group-form.tsx
new file mode 100644
index 0000000..51ceb3b
--- /dev/null
+++ b/components/user/add-to-group-form.tsx
@@ -0,0 +1,101 @@
+"use client"
+
+import * as React from "react"
+import { useTranslation } from "react-i18next"
+import { Badge } from "@/components/ui/badge"
+import { Button } from "@/components/ui/button"
+import { Dialog, DialogContent, DialogFooter, DialogHeader, DialogTitle } from "@/components/ui/dialog"
+import { Spinner } from "@/components/ui/spinner"
+import { useGroups } from "@/hooks/use-groups"
+import { useMessage } from "@/lib/feedback/message"
+import { buildAddUsersToGroupsRequests } from "@/lib/user-group-memberships"
+import { UserEditGroups } from "./edit/groups"
+
+interface UserAddToGroupFormProps {
+  open: boolean
+  onOpenChange: (open: boolean) => void
+  selectedUsers: string[]
+  onSuccess: () => void
+}
+
+export function UserAddToGroupForm({ open, onOpenChange, selectedUsers, onSuccess }: UserAddToGroupFormProps) {
+  const { t } = useTranslation()
+  const message = useMessage()
+  const { listGroup, updateGroupMembers } = useGroups()
+  const [groups, setGroups] = React.useState<string[]>([])
+  const [groupsList, setGroupsList] = React.useState<{ label: string; value: string }[]>([])
+  const [loading, setLoading] = React.useState(false)
+  const [submitting, setSubmitting] = React.useState(false)
+
+  React.useEffect(() => {
+    if (!open) return
+
+    setGroups([])
+    setLoading(true)
+    listGroup()
+      .then((res) => {
+        setGroupsList((res as string[] | undefined)?.map((group) => ({ label: group, value: group })) ?? [])
+      })
+      .catch(() => {
+        message.error(t("Failed to get data"))
+      })
+      .finally(() => setLoading(false))
+  }, [listGroup, message, open, t])
+
+  const closeModal = () => onOpenChange(false)
+
+  const submitForm = async () => {
+    const requests = buildAddUsersToGroupsRequests(selectedUsers, groups)
+    if (!requests.length) {
+      message.error(t("Please select at least one item"))
+      return
+    }
+
+    setSubmitting(true)
+    try {
+      await Promise.all(requests.map((request) => updateGroupMembers(request)))
+      message.success(t("Edit Success"))
+      onOpenChange(false)
+      onSuccess()
+    } catch (error) {
+      console.error(error)
+      message.error((error as Error)?.message || t("Edit Failed"))
+    } finally {
+      setSubmitting(false)
+    }
+  }
+
+  return (
+    <Dialog open={open} onOpenChange={closeModal}>
+      <DialogContent className="sm:max-w-lg" onPointerDownOutside={(e) => e.preventDefault()}>
+        <DialogHeader>
+          <DialogTitle>{t("Add to Group")}</DialogTitle>
+        </DialogHeader>
+
+        <div className="space-y-4">
+          <div className="space-y-2">
+            <div className="text-sm font-medium">{t("Users")}</div>
+            <div className="flex flex-wrap gap-2">
+              {selectedUsers.map((user) => (
+                <Badge key={user} variant="secondary">
+                  {user}
+                </Badge>
+              ))}
+            </div>
+          </div>
+          <UserEditGroups value={groups} options={groupsList} disabled={loading || submitting} onChange={setGroups} />
+        </div>
+
+        <DialogFooter>
+          <Button variant="outline" onClick={closeModal} disabled={submitting}>
+            {t("Cancel")}
+          </Button>
+          <Button onClick={submitForm} disabled={loading || submitting || !selectedUsers.length}>
+            {submitting ? <Spinner className="size-4" /> : null}
+            <span>{t("Submit")}</span>
+          </Button>
+        </DialogFooter>
+      </DialogContent>
+    </Dialog>
+  )
+}
diff --git a/lib/user-group-memberships.js b/lib/user-group-memberships.js
new file mode 100644
index 0000000..a607798
--- /dev/null
+++ b/lib/user-group-memberships.js
@@ -0,0 +1,13 @@
+export function buildAddUsersToGroupsRequests(users, groups) {
+  const normalizedUsers = users.map((user) => user.trim()).filter(Boolean)
+  const normalizedGroups = groups.map((group) => group.trim()).filter(Boolean)
+
+  return normalizedUsers.flatMap((user) =>
+    normalizedGroups.map((group) => ({
+      group,
+      members: [user],
+      isRemove: false,
+      groupStatus: "enabled",
+    })),
+  )
+}
diff --git a/lib/user-group-memberships.ts b/lib/user-group-memberships.ts
new file mode 100644
index 0000000..29f3d1e
--- /dev/null
+++ b/lib/user-group-memberships.ts
@@ -0,0 +1,20 @@
+export interface UpdateGroupMembersRequest {
+  group: string
+  members: string[]
+  isRemove: boolean
+  groupStatus: string
+}
+
+export function buildAddUsersToGroupsRequests(users: string[], groups: string[]): UpdateGroupMembersRequest[] {
+  const normalizedUsers = users.map((user) => user.trim()).filter(Boolean)
+  const normalizedGroups = groups.map((group) => group.trim()).filter(Boolean)
+
+  return normalizedUsers.flatMap((user) =>
+    normalizedGroups.map((group) => ({
+      group,
+      members: [user],
+      isRemove: false,
+      groupStatus: "enabled",
+    })),
+  )
+}
diff --git a/tests/lib/user-group-memberships.test.js b/tests/lib/user-group-memberships.test.js
new file mode 100644
index 0000000..e89b6b2
--- /dev/null
+++ b/tests/lib/user-group-memberships.test.js
@@ -0,0 +1,44 @@
+import test from "node:test"
+import assert from "node:assert/strict"
+
+import { buildAddUsersToGroupsRequests } from "../../lib/user-group-memberships.js"
+
+test("buildAddUsersToGroupsRequests creates one add-members request per selected user and group", () => {
+  assert.deepEqual(buildAddUsersToGroupsRequests(["alice", "bob"], ["admins", "auditors"]), [
+    {
+      group: "admins",
+      members: ["alice"],
+      isRemove: false,
+      groupStatus: "enabled",
+    },
+    {
+      group: "auditors",
+      members: ["alice"],
+      isRemove: false,
+      groupStatus: "enabled",
+    },
+    {
+      group: "admins",
+      members: ["bob"],
+      isRemove: false,
+      groupStatus: "enabled",
+    },
+    {
+      group: "auditors",
+      members: ["bob"],
+      isRemove: false,
+      groupStatus: "enabled",
+    },
+  ])
+})
+
+test("buildAddUsersToGroupsRequests ignores blank users and groups", () => {
+  assert.deepEqual(buildAddUsersToGroupsRequests([" alice ", ""], [" admins ", ""]), [
+    {
+      group: "admins",
+      members: ["alice"],
+      isRemove: false,
+      groupStatus: "enabled",
+    },
+  ])
+})