diff --git a/packages/squared/src/components/PrimaryNavigation/PrimaryNavigation.stories.tsx b/packages/squared/src/components/PrimaryNavigation/PrimaryNavigation.stories.tsx
new file mode 100644
index 0000000..1523f6c
--- /dev/null
+++ b/packages/squared/src/components/PrimaryNavigation/PrimaryNavigation.stories.tsx
@@ -0,0 +1,61 @@
+import type { Meta, StoryObj } from '@storybook/react';
+import { within, userEvent, screen } from '@storybook/testing-library';
+import { expect } from '@storybook/jest';
+
+import { ChevronDown } from 'react-feather';
+
+import { PrimaryNavigation } from './PrimaryNavigation';
+
+const meta: Meta<typeof PrimaryNavigation> = {
+  title: 'Components/PrimaryNavigation',
+  component: PrimaryNavigation,
+  parameters: {
+    layout: 'centered',
+    backgrounds: {
+      default: 'dark',
+      values: [{ name: 'dark', value: '#1f2121' }],
+    },
+  },
+};
+
+export default meta;
+type Story = StoryObj<typeof PrimaryNavigation>;
+
+export const Default: Story = {
+  args: {},
+  render: (args) => (
+    <PrimaryNavigation {...args}>
+      <PrimaryNavigation.Item>
+        <PrimaryNavigation.TriggerLink href="#">
+          Portal
+        </PrimaryNavigation.TriggerLink>
+      </PrimaryNavigation.Item>
+
+      <PrimaryNavigation.Item>
+        <PrimaryNavigation.TriggerLink href="/nb">
+          Notebooks
+        </PrimaryNavigation.TriggerLink>
+      </PrimaryNavigation.Item>
+
+      <PrimaryNavigation.Item>
+        <PrimaryNavigation.TriggerLink href="/docs">
+          Documentation
+        </PrimaryNavigation.TriggerLink>
+      </PrimaryNavigation.Item>
+
+      <PrimaryNavigation.Item>
+        <PrimaryNavigation.Trigger>
+          Account <ChevronDown />
+        </PrimaryNavigation.Trigger>
+        <PrimaryNavigation.SubMenuContent>
+          <PrimaryNavigation.MenuItem>
+            <PrimaryNavigation.Link href="#">Settings</PrimaryNavigation.Link>
+          </PrimaryNavigation.MenuItem>
+          <PrimaryNavigation.MenuItem>
+            <PrimaryNavigation.Link href="#">Logout</PrimaryNavigation.Link>
+          </PrimaryNavigation.MenuItem>
+        </PrimaryNavigation.SubMenuContent>
+      </PrimaryNavigation.Item>
+    </PrimaryNavigation>
+  ),
+};
diff --git a/packages/squared/src/components/PrimaryNavigation/PrimaryNavigation.tsx b/packages/squared/src/components/PrimaryNavigation/PrimaryNavigation.tsx
new file mode 100644
index 0000000..c66beba
--- /dev/null
+++ b/packages/squared/src/components/PrimaryNavigation/PrimaryNavigation.tsx
@@ -0,0 +1,180 @@
+import React from 'react';
+import styled from 'styled-components';
+
+import * as RadixNavigationMenu from '@radix-ui/react-navigation-menu';
+
+export interface PrimaryNavigationProps {
+  children: React.ReactNode;
+}
+
+export const PrimaryNavigation = ({ children }: PrimaryNavigationProps) => {
+  return (
+    <MenuRoot>
+      <MenuList>{children}</MenuList>
+      <ViewportContainer>
+        <ContentViewport
+          onPointerEnter={(event) => event.preventDefault()}
+          onPointerLeave={(event) => event.preventDefault()}
+        />
+      </ViewportContainer>
+    </MenuRoot>
+  );
+};
+
+const MenuRoot = styled(RadixNavigationMenu.Root)`
+  position: relative;
+`;
+
+const MenuList = styled(RadixNavigationMenu.List)`
+  list-style: none;
+  margin-bottom: 0;
+  padding: 0;
+  display: flex;
+  justify-self: end;
+  width: 100%;
+  font-size: 1.2rem;
+`;
+
+const MenuItem = styled(RadixNavigationMenu.Item)`
+  margin: 0 1em;
+`;
+
+const TriggerLink = styled(RadixNavigationMenu.Link)`
+  color: var(--rsd-component-header-nav-text-color);
+  border: none;
+  border-radius: 0.5rem;
+  padding: 2px 4px;
+  display: inline-block; // For consistency with MenuTrigger button
+  /* padding: 0; */
+
+  &:hover {
+    color: var(--rsd-component-header-nav-text-hover-color);
+  }
+
+  &:focus {
+    outline: 1px solid var(--rsd-color-primary-500);
+  }
+`;
+
+const MenuTrigger = styled(RadixNavigationMenu.Trigger)`
+  color: var(--rsd-component-header-nav-text-color);
+  padding: 2px 4px;
+  /* padding: 0; */
+
+  // Reset button styles
+  background-color: transparent;
+  border: none;
+  border-radius: 0.5rem;
+
+  &:focus {
+    outline: 1px solid var(--rsd-color-primary-500);
+  }
+
+  &:hover {
+    color: var(--rsd-component-header-nav-text-hover-color);
+  }
+
+  svg {
+    display: inline-block;
+    width: 1rem;
+    height: 1rem;
+    vertical-align: middle;
+  }
+
+  &[data-state='open'] {
+    svg {
+      transform: rotate(180deg);
+    }
+  }
+`;
+
+const SubMenuContent = styled(RadixNavigationMenu.Content)`
+  /* This unit for the padding is also the basis for the spacing and
+   * sizing of the menu items.
+  */
+  --gafaelfawr-user-menu-padding: 0.5rem;
+
+  display: flex;
+  flex-direction: column;
+  gap: 0.25rem;
+
+  list-style: none;
+
+  font-size: 1rem;
+  background-color: var(--rsd-component-header-nav-menulist-background-color);
+  min-width: 12rem;
+  border-radius: 0.5rem;
+  padding: var(--gafaelfawr-user-menu-padding);
+  padding-right: 0; // to avoid double padding on the right side with MenuLink
+  box-shadow: 0px 10px 38px -10px rgba(22, 23, 24, 0.35),
+    0px 10px 20px -15px rgba(22, 23, 24, 0.2);
+  animation-duration: 400ms;
+  animation-timing-function: cubic-bezier(0.16, 1, 0.3, 1);
+  will-change: transform, opacity;
+`;
+
+const MenuContentItem = styled(RadixNavigationMenu.Item)`
+  display: flex;
+`;
+
+export const MenuLink = styled(RadixNavigationMenu.Link)`
+  /* The styling on the menu triggers is overriding this colour. Need to re-address. */
+  border-radius: 0.5rem;
+  padding: calc(var(--gafaelfawr-user-menu-padding) / 2)
+    var(--gafaelfawr-user-menu-padding);
+  margin: calc(var(--gafaelfawr-user-menu-padding) / -2);
+  margin-bottom: calc(var(--gafaelfawr-user-menu-padding) / 2);
+  width: 100%;
+
+  color: var(--rsd-component-header-nav-menulist-text-color);
+
+  &:last-of-type {
+    margin-bottom: 0;
+  }
+
+  outline: 1px solid transparent;
+
+  &:focus {
+    outline: 1px solid
+      var(--rsd-component-header-nav-menulist-selected-background-color);
+  }
+
+  &:hover {
+    background-color: var(
+      --rsd-component-header-nav-menulist-selected-background-color
+    );
+    color: white !important;
+  }
+`;
+
+const ViewportContainer = styled.div`
+  position: absolute;
+  display: flex;
+  justify-content: center;
+  width: 100%;
+  top: 100%;
+  left: 0;
+  perspective: 2000px;
+`;
+
+const ContentViewport = styled(RadixNavigationMenu.Viewport)`
+  position: relative;
+  transform-origin: top center;
+  margin-top: 10px;
+  width: 100%;
+  background-color: white;
+  border-radius: 6px;
+  overflow: hidden;
+  height: var(--radix-navigation-menu-viewport-height);
+  width: var(--radix-navigation-menu-viewport-width);
+`;
+
+// Associate child components with the parent for easier imports.
+PrimaryNavigation.TriggerLink = TriggerLink;
+PrimaryNavigation.Link = MenuLink;
+PrimaryNavigation.Item = MenuItem;
+PrimaryNavigation.MenuItem = MenuContentItem;
+PrimaryNavigation.Trigger = MenuTrigger;
+PrimaryNavigation.SubMenuContent = SubMenuContent;
+
+export default PrimaryNavigation;
diff --git a/packages/squared/src/components/PrimaryNavigation/index.ts b/packages/squared/src/components/PrimaryNavigation/index.ts
new file mode 100644
index 0000000..c49d4ea
--- /dev/null
+++ b/packages/squared/src/components/PrimaryNavigation/index.ts
@@ -0,0 +1,2 @@
+export * from './PrimaryNavigation';
+export { default } from './PrimaryNavigation';
diff --git a/packages/squared/src/index.ts b/packages/squared/src/index.ts
index 708b843..a2b6cd0 100644
--- a/packages/squared/src/index.ts
+++ b/packages/squared/src/index.ts
@@ -9,6 +9,10 @@ export {
   type GafaelfawrUserMenuProps,
 } from './components/GafaelfawrUserMenu';
 export { default as IconPill, type IconPillProps } from './components/IconPill';
+export {
+  default as PrimaryNavigation,
+  type PrimaryNavigationProps,
+} from './components/PrimaryNavigation';
 
 /* Hooks */
 export { default as useCurrentUrl } from './hooks/useCurrentUrl';