diff --git a/Frontend/src/components/shell/TopBar/ProfileMenu.module.scss b/Frontend/src/components/shell/TopBar/ProfileMenu.module.scss
new file mode 100644
index 0000000..b12fd01
--- /dev/null
+++ b/Frontend/src/components/shell/TopBar/ProfileMenu.module.scss
@@ -0,0 +1,165 @@
+.menu {
+  position: absolute;
+  top: calc(100% + var(--space-2));
+  right: 0;
+  width: min(21rem, calc(100vw - (var(--space-4) * 2)));
+  display: grid;
+  gap: var(--space-3);
+  padding: var(--space-3);
+  border: 1px solid var(--color-border-strong);
+  border-radius: calc(var(--radius-lg) + 0.1rem);
+  background: color-mix(in srgb, var(--color-surface-muted) 96%, transparent);
+  box-shadow: 0 18px 36px color-mix(in srgb, black 16%, transparent);
+  backdrop-filter: blur(18px);
+  z-index: 30;
+}
+
+.summary {
+  display: grid;
+  grid-template-columns: auto minmax(0, 1fr);
+  gap: var(--space-3);
+  align-items: center;
+  padding-bottom: var(--space-3);
+  border-bottom: 1px solid var(--color-border);
+}
+
+.avatar {
+  position: relative;
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  width: 3rem;
+  height: 3rem;
+  align-self: center;
+  margin-right: var(--space-1);
+}
+
+.avatarRing {
+  position: absolute;
+  inset: 0;
+  border-radius: 999px;
+  background:
+    conic-gradient(
+      from 0deg,
+      transparent 0deg 24deg,
+      var(--color-primary-1) 24deg 118deg,
+      transparent 118deg 144deg,
+      var(--color-primary-2) 144deg 238deg,
+      transparent 238deg 264deg,
+      var(--color-primary-3) 264deg 356deg,
+      transparent 356deg 360deg
+    );
+  mask: radial-gradient(circle, transparent 64%, black 67%);
+  -webkit-mask: radial-gradient(circle, transparent 64%, black 67%);
+}
+
+.avatarCore {
+  @include text-label;
+  position: relative;
+  z-index: 1;
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  width: 78%;
+  height: 78%;
+  border-radius: 999px;
+  background: var(--color-surface);
+  color: var(--color-text);
+  font-weight: var(--font-weight-semibold);
+}
+
+.summaryCopy {
+  min-width: 0;
+  display: grid;
+  gap: 0.08rem;
+}
+
+.name,
+.itemLabel {
+  @include text-label;
+}
+
+.name {
+  color: var(--color-text);
+}
+
+.email,
+.role,
+.context {
+  @include text-caption;
+  color: var(--color-text-muted);
+}
+
+.context {
+  margin-top: var(--space-1);
+  color: var(--color-text-subtle);
+}
+
+.section {
+  display: grid;
+  gap: 0.2rem;
+}
+
+.section + .section {
+  padding-top: var(--space-3);
+  border-top: 1px solid var(--color-border);
+}
+
+.item {
+  width: 100%;
+  min-width: 0;
+  min-height: 2.65rem;
+  display: grid;
+  grid-template-columns: auto minmax(0, 1fr);
+  align-items: center;
+  gap: var(--space-2);
+  padding: var(--space-2);
+  border: 1px solid transparent;
+  border-radius: var(--radius-sm);
+  background: transparent;
+  color: var(--color-text);
+  text-align: left;
+  transition:
+    background-color 160ms var(--easing-standard),
+    border-color 160ms var(--easing-standard),
+    color 160ms var(--easing-standard);
+}
+
+.item:hover {
+  background: color-mix(in srgb, var(--color-surface) 88%, transparent);
+  border-color: color-mix(in srgb, var(--color-border) 20%, transparent);
+}
+
+.item:focus-visible {
+  outline: none;
+  background: color-mix(in srgb, var(--color-surface) 92%, transparent);
+  border-color: color-mix(in srgb, var(--color-accent-soft) 52%, transparent);
+  box-shadow: 0 0 0 0.12rem color-mix(in srgb, var(--color-accent-soft) 14%, transparent);
+}
+
+.itemDanger {
+  color: color-mix(in srgb, var(--color-primary-3) 74%, var(--color-text) 26%);
+}
+
+.itemDanger:hover,
+.itemDanger:focus-visible {
+  background: color-mix(in srgb, var(--color-primary-3) 8%, transparent);
+  border-color: color-mix(in srgb, var(--color-primary-3) 16%, transparent);
+}
+
+.itemIcon {
+  width: 1.9rem;
+  height: 1.9rem;
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  border-radius: var(--radius-sm);
+  background: color-mix(in srgb, var(--color-surface) 92%, transparent);
+  color: currentColor;
+}
+
+@include respond-down(mobile) {
+  .menu {
+    width: min(20rem, calc(100vw - (var(--space-3) * 2)));
+  }
+}
diff --git a/Frontend/src/components/shell/TopBar/ProfileMenu.tsx b/Frontend/src/components/shell/TopBar/ProfileMenu.tsx
new file mode 100644
index 0000000..5d462a1
--- /dev/null
+++ b/Frontend/src/components/shell/TopBar/ProfileMenu.tsx
@@ -0,0 +1,61 @@
+import { For, type JSX } from "solid-js";
+import { User } from "../../../lib/icons";
+import { activeUserProfile, profileMenuSections } from "../data/shell.data";
+import styles from "./ProfileMenu.module.scss";
+
+type ProfileMenuProps = {
+	id: string;
+	menuRef: (element: HTMLDivElement) => void;
+	onSelect: () => void;
+};
+
+export const ProfileMenu = (props: ProfileMenuProps): JSX.Element => {
+	return (
+		<div id={props.id} class={styles.menu} role="menu" aria-label="Profile menu" ref={props.menuRef}>
+			<div class={styles.summary}>
+				<div class={styles.avatar} aria-hidden="true">
+					<span class={styles.avatarRing} />
+					<span class={styles.avatarCore}>
+						<User size={16} strokeWidth={2} />
+					</span>
+				</div>
+
+				<div class={styles.summaryCopy}>
+					<strong class={styles.name}>{activeUserProfile.name}</strong>
+					<span class={styles.email}>{activeUserProfile.email}</span>
+					<span class={styles.role}>{activeUserProfile.roleLabel}</span>
+					<span class={styles.context}>{activeUserProfile.contextLabel}</span>
+				</div>
+			</div>
+
+			<For each={profileMenuSections}>
+				{(section): JSX.Element => (
+					<div class={styles.section}>
+						<For each={section.items}>
+							{(item): JSX.Element => {
+								const Icon = item.icon;
+
+								return (
+									<button
+										type="button"
+										role="menuitem"
+										classList={{
+											[styles.item]: true,
+											[styles.itemDanger]: item.tone === "danger",
+										}}
+										onClick={props.onSelect}
+									>
+										<span class={styles.itemIcon} aria-hidden="true">
+											<Icon size={16} strokeWidth={2} />
+										</span>
+										<span class={styles.itemLabel}>{item.label}</span>
+									</button>
+								);
+							}}
+						</For>
+					</div>
+				)}
+			</For>
+		</div>
+	);
+};
diff --git a/Frontend/src/components/shell/TopBar/TopBar.tsx b/Frontend/src/components/shell/TopBar/TopBar.tsx
index 4bb49a2..7b6bd13 100644
--- a/Frontend/src/components/shell/TopBar/TopBar.tsx
+++ b/Frontend/src/components/shell/TopBar/TopBar.tsx
@@ -5,7 +5,7 @@ import type { Theme } from "../../../theme/runtime";
 import { topBarActions } from "../data/shell.data";
 import { DepartmentSelector } from "../DepartmentSelector/DepartmentSelector";
 import { ThemeToggle } from "./ThemeToggle";
-import { UserNavButton } from "./UserNavButton";
+import { UserNav } from "./UserNav";
 import styles from "./TopBar.module.scss";
 
 type TopBarProps = {
@@ -37,7 +37,7 @@ export const TopBar = (props: TopBarProps): JSX.Element => {
 				</div>
 
 				<ThemeToggle theme={props.theme} onToggle={props.onToggleTheme} />
-				<UserNavButton />
+				<UserNav />
 			</div>
 		</header>
 	);
diff --git a/Frontend/src/components/shell/TopBar/UserNav.module.scss b/Frontend/src/components/shell/TopBar/UserNav.module.scss
new file mode 100644
index 0000000..bbfe5ed
--- /dev/null
+++ b/Frontend/src/components/shell/TopBar/UserNav.module.scss
@@ -0,0 +1,5 @@
+.root {
+	position: relative;
+	display: inline-flex;
+	align-items: center;
+}
diff --git a/Frontend/src/components/shell/TopBar/UserNav.tsx b/Frontend/src/components/shell/TopBar/UserNav.tsx
new file mode 100644
index 0000000..13bf17e
--- /dev/null
+++ b/Frontend/src/components/shell/TopBar/UserNav.tsx
@@ -0,0 +1,54 @@
+import { createEffect, createSignal, createUniqueId, onCleanup, type JSX } from "solid-js";
+import { ProfileMenu } from "./ProfileMenu";
+import { UserNavButton } from "./UserNavButton";
+import styles from "./UserNav.module.scss";
+
+export const UserNav = (): JSX.Element => {
+	const [isOpen, setIsOpen] = createSignal(false);
+	const menuId = createUniqueId();
+	let rootRef: HTMLDivElement | undefined;
+	let menuRef: HTMLDivElement | undefined;
+
+	const closeMenu = (): void => {
+		setIsOpen(false);
+	};
+
+	const toggleMenu = (): void => {
+		setIsOpen((open) => !open);
+	};
+
+	createEffect(() => {
+		if (!isOpen()) return;
+
+		const handlePointerDown = (event: PointerEvent): void => {
+			if (!rootRef) return;
+
+			const target = event.target;
+			if (target instanceof Node && !rootRef.contains(target)) {
+				closeMenu();
+			}
+		};
+
+		const handleKeyDown = (event: KeyboardEvent): void => {
+			if (event.key === "Escape") {
+				closeMenu();
+			}
+		};
+
+		document.addEventListener("pointerdown", handlePointerDown);
+		document.addEventListener("keydown", handleKeyDown);
+		menuRef?.querySelector<HTMLButtonElement>("[role='menuitem']")?.focus();
+
+		onCleanup(() => {
+			document.removeEventListener("pointerdown", handlePointerDown);
+			document.removeEventListener("keydown", handleKeyDown);
+		});
+	});
+
+	return (
+		<div class={styles.root} ref={rootRef}>
+			<UserNavButton isOpen={isOpen()} menuId={menuId} onToggle={toggleMenu} />
+			{isOpen() ? <ProfileMenu id={menuId} menuRef={(element) => (menuRef = element)} onSelect={closeMenu} /> : null}
+		</div>
+	);
+};
diff --git a/Frontend/src/components/shell/TopBar/UserNavButton.module.scss b/Frontend/src/components/shell/TopBar/UserNavButton.module.scss
index d33f387..64107d4 100644
--- a/Frontend/src/components/shell/TopBar/UserNavButton.module.scss
+++ b/Frontend/src/components/shell/TopBar/UserNavButton.module.scss
@@ -23,7 +23,12 @@
   color: var(--color-text);
 }
 
-.userButton:hover .spinContainer {
+.userButtonOpen {
+  color: var(--color-text);
+}
+
+.userButton:hover .spinContainer,
+.userButtonOpen .spinContainer {
   animation-play-state: running;
   opacity: 1;
 }
diff --git a/Frontend/src/components/shell/TopBar/UserNavButton.tsx b/Frontend/src/components/shell/TopBar/UserNavButton.tsx
index 06b3955..6d28932 100644
--- a/Frontend/src/components/shell/TopBar/UserNavButton.tsx
+++ b/Frontend/src/components/shell/TopBar/UserNavButton.tsx
@@ -4,9 +4,27 @@ import type { JSX } from "solid-js";
 import { User } from "../../../lib/icons";
 import styles from "./UserNavButton.module.scss";
 
-export const UserNavButton = (): JSX.Element => {
+type UserNavButtonProps = {
+	isOpen: boolean;
+	menuId: string;
+	onToggle: () => void;
+};
+
+export const UserNavButton = (props: UserNavButtonProps): JSX.Element => {
 	return (
-		<button class={styles.userButton} type="button" aria-label="Open profile" title="Open profile">
+		<button
+			classList={{
+				[styles.userButton]: true,
+				[styles.userButtonOpen]: props.isOpen,
+			}}
+			type="button"
+			aria-label={props.isOpen ? "Close profile menu" : "Open profile menu"}
+			title={props.isOpen ? "Close profile menu" : "Open profile menu"}
+			aria-haspopup="menu"
+			aria-controls={props.menuId}
+			aria-expanded={props.isOpen}
+			onClick={props.onToggle}
+		>
 			<span class={styles.spinContainer} aria-hidden="true">
 				<span class={styles.spinRing} />
 			</span>
diff --git a/Frontend/src/components/shell/data/shell.data.ts b/Frontend/src/components/shell/data/shell.data.ts
index e5371fc..15158a5 100644
--- a/Frontend/src/components/shell/data/shell.data.ts
+++ b/Frontend/src/components/shell/data/shell.data.ts
@@ -1,7 +1,20 @@
 // Path: Frontend/src/components/shell/data/shell.data.ts
 
 import type { Component } from "solid-js";
-import { Bell, Folder, Home, LayoutGrid, Search, Settings, User } from "../../../lib/icons";
+import {
+	Bell,
+	CircleHelp,
+	Folder,
+	Home,
+	Keyboard,
+	LayoutGrid,
+	LogOut,
+	Repeat,
+	Search,
+	Settings,
+	Shield,
+	User,
+} from "../../../lib/icons";
 
 type ShellIconProps = {
 	class?: string;
@@ -74,6 +87,25 @@ export type TopBarAction = {
 	icon: ShellIcon;
 };
 
+export type ProfileMenuAction = {
+	id: string;
+	label: string;
+	icon: ShellIcon;
+	tone?: "default" | "danger";
+};
+
+export type ProfileMenuSection = {
+	id: string;
+	items: readonly ProfileMenuAction[];
+};
+
+export type ActiveUserProfile = {
+	name: string;
+	email: string;
+	roleLabel: string;
+	contextLabel: string;
+};
+
 const personalDockActions: readonly ServerDockAction[] = [
 	{ id: "account", label: "Account", icon: User },
 	{ id: "settings", label: "Settings", icon: Settings },
@@ -136,3 +168,37 @@ export const topBarActions: readonly TopBarAction[] = [
 	{ id: "search", label: "Search", icon: Search },
 	{ id: "inbox", label: "Inbox", icon: Bell },
 ] as const;
+
+export const activeUserProfile: ActiveUserProfile = {
+	name: "Demo Account",
+	email: "demo@moku.work",
+	roleLabel: "Founder · Product",
+	contextLabel: "Organization Name • Design Systems",
+};
+
+export const profileMenuSections: readonly ProfileMenuSection[] = [
+	{
+		id: "account",
+		items: [
+			{ id: "profile", label: "Profile", icon: User },
+			{ id: "account-settings", label: "Account Settings", icon: Settings },
+			{ id: "notifications", label: "Notifications", icon: Bell },
+			{ id: "security", label: "Security", icon: Shield },
+		],
+	},
+	{
+		id: "preferences",
+		items: [
+			{ id: "keyboard-shortcuts", label: "Keyboard Shortcuts", icon: Keyboard },
+			{ id: "theme-preferences", label: "Theme Preferences", icon: Settings },
+			{ id: "help-support", label: "Help & Support", icon: CircleHelp },
+		],
+	},
+	{
+		id: "session",
+		items: [
+			{ id: "switch-account", label: "Switch Account", icon: Repeat },
+			{ id: "sign-out", label: "Sign Out", icon: LogOut, tone: "danger" },
+		],
+	},
+] as const;
diff --git a/Frontend/src/lib/icons/index.ts b/Frontend/src/lib/icons/index.ts
index f8ca517..84dda5f 100644
--- a/Frontend/src/lib/icons/index.ts
+++ b/Frontend/src/lib/icons/index.ts
@@ -1,13 +1,19 @@
 // Path: Frontend/src/lib/icons/index.ts
 
 export { default as Bell } from "lucide-solid/icons/bell";
+export { default as CircleHelp } from "lucide-solid/icons/circle-help";
 export { default as ChevronDown } from "lucide-solid/icons/chevron-down";
 export { default as Folder } from "lucide-solid/icons/folder";
 export { default as Home } from "lucide-solid/icons/house";
+export { default as Keyboard } from "lucide-solid/icons/keyboard";
 export { default as LayoutGrid } from "lucide-solid/icons/layout-grid";
+export { default as LogOut } from "lucide-solid/icons/log-out";
 export { default as Moon } from "lucide-solid/icons/moon";
 export { default as Plus } from "lucide-solid/icons/plus";
+export { default as Repeat } from "lucide-solid/icons/repeat";
 export { default as Search } from "lucide-solid/icons/search";
+export { default as Server } from "lucide-solid/icons/server";
 export { default as Settings } from "lucide-solid/icons/settings";
+export { default as Shield } from "lucide-solid/icons/shield";
 export { default as Sun } from "lucide-solid/icons/sun";
 export { default as User } from "lucide-solid/icons/user";