diff --git a/.playground/pages/composant/site/siteSelector.vue b/.playground/pages/composant/site/siteSelector.vue
new file mode 100644
index 0000000..5389c12
--- /dev/null
+++ b/.playground/pages/composant/site/siteSelector.vue
@@ -0,0 +1,67 @@
+<template>
+  <div class="grid grid-cols-1 items-start gap-6">
+    <div class="rounded-lg border p-4">
+      <h2 class="mb-4 text-xl font-bold">Simple (3 sites) + event change</h2>
+      <MalioSiteSelector v-model="simpleValue" :sites="sites" @change="onSiteChange" />
+      <p class="mt-3 text-sm text-gray-600">Site sélectionné : <code>{{ simpleValue }}</code></p>
+      <p class="mt-1 text-sm text-gray-600">Dernier event <code>change</code> : <code>{{ lastChange }}</code></p>
+    </div>
+
+    <div class="rounded-lg border p-4">
+      <h2 class="mb-4 text-xl font-bold">Deux sites</h2>
+      <MalioSiteSelector v-model="twoValue" :sites="sitesTwo" />
+      <p class="mt-3 text-sm text-gray-600">Site sélectionné : <code>{{ twoValue }}</code></p>
+    </div>
+
+    <div class="rounded-lg border p-4">
+      <h2 class="mb-4 text-xl font-bold">Cinq sites (largeur proportionnelle)</h2>
+      <MalioSiteSelector v-model="fiveValue" :sites="sitesFive" />
+      <p class="mt-3 text-sm text-gray-600">Site sélectionné : <code>{{ fiveValue }}</code></p>
+    </div>
+
+    <div class="rounded-lg border p-4">
+      <h2 class="mb-4 text-xl font-bold">Non contrôlé (sans v-model)</h2>
+      <MalioSiteSelector :sites="sites" />
+    </div>
+
+    <div class="rounded-lg border p-4">
+      <h2 class="mb-4 text-xl font-bold">Largeur contrainte</h2>
+      <div class="w-[480px]">
+        <MalioSiteSelector v-model="constrainedValue" :sites="sites" />
+      </div>
+    </div>
+  </div>
+</template>
+
+<script setup lang="ts">
+import { ref } from 'vue'
+
+const sites = [
+  { id: 'chatellerault', name: 'Châtellerault', color: '#0055ff' },
+  { id: 'saint-jean', name: 'Saint-Jean', color: '#16a34a' },
+  { id: 'pommevic', name: 'Pommevic', color: '#dc2626' },
+]
+
+const sitesTwo = [
+  { id: 'nord', name: 'Usine Nord', color: '#7c3aed' },
+  { id: 'sud', name: 'Usine Sud', color: '#ea580c' },
+]
+
+const sitesFive = [
+  { id: 's1', name: 'Site 1', color: '#0ea5e9' },
+  { id: 's2', name: 'Site 2', color: '#14b8a6' },
+  { id: 's3', name: 'Site 3', color: '#f59e0b' },
+  { id: 's4', name: 'Site 4', color: '#ec4899' },
+  { id: 's5', name: 'Site 5', color: '#6366f1' },
+]
+
+const simpleValue = ref('chatellerault')
+const twoValue = ref('nord')
+const fiveValue = ref('s3')
+const constrainedValue = ref('saint-jean')
+const lastChange = ref<string>('—')
+
+function onSiteChange(site: { id: string; name: string; color: string }) {
+  lastChange.value = JSON.stringify(site)
+}
+</script>
diff --git a/CHANGELOG.md b/CHANGELOG.md
index efdec6d..9241921 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -25,6 +25,7 @@ Liste des évolutions de la librairie Malio layer UI
 * [#MUI-2] Faire un MCP pour la librairie de composant
 * [#MUI-15] Création d'un composant drawer
 * [#MUI-22] Création d'un composant datatable
+* [#MUI-27] Création d'un composant sélection de site
 
 ### Changed
 
diff --git a/app/components/malio/site/SiteSelector.test.ts b/app/components/malio/site/SiteSelector.test.ts
new file mode 100644
index 0000000..4ee9654
--- /dev/null
+++ b/app/components/malio/site/SiteSelector.test.ts
@@ -0,0 +1,154 @@
+import {describe, expect, it} from 'vitest'
+import {mount} from '@vue/test-utils'
+import type {DefineComponent} from 'vue'
+import SiteSelector from './SiteSelector.vue'
+
+type Site = {
+  id: string
+  name: string
+  color: string
+}
+
+type SiteSelectorProps = {
+  sites: Site[]
+  modelValue?: string
+  id?: string
+  groupClass?: string
+  tileClass?: string
+  labelClass?: string
+}
+
+const SiteSelectorForTest = SiteSelector as DefineComponent<SiteSelectorProps>
+
+const sites: Site[] = [
+  {id: 'chatellerault', name: 'Châtellerault', color: '#2563eb'},
+  {id: 'saint-jean', name: 'Saint-Jean', color: '#16a34a'},
+  {id: 'pommevic', name: 'Pommevic', color: '#dc2626'},
+]
+
+function mountComponent(props: SiteSelectorProps) {
+  return mount(SiteSelectorForTest, {props})
+}
+
+describe('MalioSiteSelector', () => {
+  it('renders one tile per site with the site name', () => {
+    const wrapper = mountComponent({sites})
+    const tiles = wrapper.findAll('[role="radio"]')
+    expect(tiles).toHaveLength(3)
+    expect(tiles[0]!.text()).toBe('Châtellerault')
+    expect(tiles[1]!.text()).toBe('Saint-Jean')
+    expect(tiles[2]!.text()).toBe('Pommevic')
+  })
+
+  it('has role="radiogroup" on the wrapper', () => {
+    const wrapper = mountComponent({sites})
+    expect(wrapper.find('[role="radiogroup"]').exists()).toBe(true)
+  })
+
+  it('selects the first site by default in uncontrolled mode', () => {
+    const wrapper = mountComponent({sites})
+    const tiles = wrapper.findAll('[role="radio"]')
+    expect(tiles[0]!.attributes('aria-checked')).toBe('true')
+    expect(tiles[1]!.attributes('aria-checked')).toBe('false')
+    expect(tiles[2]!.attributes('aria-checked')).toBe('false')
+  })
+
+  it('paints all tiles with the selected site color', () => {
+    const wrapper = mountComponent({sites, modelValue: 'saint-jean'})
+    const tiles = wrapper.findAll('[role="radio"]')
+    for (const tile of tiles) {
+      expect(tile.attributes('style')).toContain('background-color: rgb(22, 163, 74)')
+    }
+  })
+
+  it('applies opacity 1 on the selected tile and 0.4 on the others', () => {
+    const wrapper = mountComponent({sites, modelValue: 'chatellerault'})
+    const tiles = wrapper.findAll('[role="radio"]')
+    expect(tiles[0]!.attributes('style')).toContain('opacity: 1')
+    expect(tiles[1]!.attributes('style')).toContain('opacity: 0.4')
+    expect(tiles[2]!.attributes('style')).toContain('opacity: 0.4')
+  })
+
+  it('updates the shared color when the selection changes', async () => {
+    const wrapper = mountComponent({sites})
+    let tiles = wrapper.findAll('[role="radio"]')
+    expect(tiles[0]!.attributes('style')).toContain('background-color: rgb(37, 99, 235)')
+
+    await tiles[2]!.trigger('click')
+    tiles = wrapper.findAll('[role="radio"]')
+    for (const tile of tiles) {
+      expect(tile.attributes('style')).toContain('background-color: rgb(220, 38, 38)')
+    }
+  })
+
+  it('emits update:modelValue with the clicked site id', async () => {
+    const wrapper = mountComponent({sites, modelValue: 'chatellerault'})
+    const tiles = wrapper.findAll('[role="radio"]')
+
+    await tiles[1]!.trigger('click')
+
+    expect(wrapper.emitted('update:modelValue')?.[0]).toEqual(['saint-jean'])
+  })
+
+  it('emits change with the full selected site object', async () => {
+    const wrapper = mountComponent({sites, modelValue: 'chatellerault'})
+    const tiles = wrapper.findAll('[role="radio"]')
+
+    await tiles[2]!.trigger('click')
+
+    expect(wrapper.emitted('change')?.[0]).toEqual([
+      {id: 'pommevic', name: 'Pommevic', color: '#dc2626'},
+    ])
+  })
+
+  it('respects modelValue in controlled mode', () => {
+    const wrapper = mountComponent({sites, modelValue: 'pommevic'})
+    const tiles = wrapper.findAll('[role="radio"]')
+    expect(tiles[0]!.attributes('aria-checked')).toBe('false')
+    expect(tiles[1]!.attributes('aria-checked')).toBe('false')
+    expect(tiles[2]!.attributes('aria-checked')).toBe('true')
+  })
+
+  it('switches selection on click in uncontrolled mode', async () => {
+    const wrapper = mountComponent({sites})
+    const tiles = wrapper.findAll('[role="radio"]')
+
+    await tiles[1]!.trigger('click')
+
+    expect(tiles[0]!.attributes('aria-checked')).toBe('false')
+    expect(tiles[1]!.attributes('aria-checked')).toBe('true')
+    expect(tiles[2]!.attributes('aria-checked')).toBe('false')
+  })
+
+  it('sets roving tabindex (active = 0, others = -1)', () => {
+    const wrapper = mountComponent({sites, modelValue: 'saint-jean'})
+    const tiles = wrapper.findAll('[role="radio"]')
+    expect(tiles[0]!.attributes('tabindex')).toBe('-1')
+    expect(tiles[1]!.attributes('tabindex')).toBe('0')
+    expect(tiles[2]!.attributes('tabindex')).toBe('-1')
+  })
+
+  it('merges groupClass, tileClass and labelClass via twMerge', () => {
+    const wrapper = mountComponent({
+      sites,
+      groupClass: 'rounded-none bg-black',
+      tileClass: 'py-10',
+      labelClass: 'text-xs',
+    })
+    const group = wrapper.find('[role="radiogroup"]')
+    expect(group.classes()).toContain('rounded-none')
+    expect(group.classes()).toContain('bg-black')
+
+    const tile = wrapper.find('[role="radio"]')
+    expect(tile.classes()).toContain('py-10')
+    expect(tile.classes()).not.toContain('py-4')
+
+    const label = tile.find('span')
+    expect(label.classes()).toContain('text-xs')
+  })
+
+  it('uses a custom id when provided', () => {
+    const wrapper = mountComponent({sites, id: 'my-selector'})
+    expect(wrapper.find('[role="radiogroup"]').attributes('id')).toBe('my-selector')
+  })
+})
diff --git a/app/components/malio/site/SiteSelector.vue b/app/components/malio/site/SiteSelector.vue
new file mode 100644
index 0000000..7b245ca
--- /dev/null
+++ b/app/components/malio/site/SiteSelector.vue
@@ -0,0 +1,104 @@
+<template>
+  <div
+    v-bind="$attrs"
+    :id="componentId"
+    role="radiogroup"
+    :class="mergedGroupClass"
+  >
+    <button
+      v-for="site in sites"
+      :key="site.id"
+      type="button"
+      role="radio"
+      :aria-checked="activeId === site.id"
+      :tabindex="activeId === site.id ? 0 : -1"
+      :style="{
+        backgroundColor: activeColor,
+        opacity: activeId === site.id ? 1 : 0.4,
+      }"
+      :class="mergedTileClass"
+      @click="select(site.id)"
+    >
+      <span :class="mergedLabelClass">{{ site.name }}</span>
+    </button>
+  </div>
+</template>
+
+<script setup lang="ts">
+import {computed, ref, useId} from 'vue'
+import {twMerge} from 'tailwind-merge'
+
+defineOptions({name: 'MalioSiteSelector', inheritAttrs: false})
+
+type Site = {
+  id: string
+  name: string
+  color: string
+}
+
+const props = withDefaults(defineProps<{
+  sites: Site[]
+  modelValue?: string
+  id?: string
+  groupClass?: string
+  tileClass?: string
+  labelClass?: string
+}>(), {
+  modelValue: undefined,
+  id: '',
+  groupClass: '',
+  tileClass: '',
+  labelClass: '',
+})
+
+const emit = defineEmits<{
+  (e: 'update:modelValue', value: string): void
+  (e: 'change', site: Site): void
+}>()
+
+const generatedId = useId()
+const componentId = computed(() => props.id || `malio-site-selector-${generatedId}`)
+
+const isControlled = computed(() => props.modelValue !== undefined)
+const localValue = ref(props.sites.length > 0 ? props.sites[0]!.id : '')
+
+const activeId = computed(() =>
+  isControlled.value ? props.modelValue! : localValue.value,
+)
+
+const activeColor = computed(() =>
+  props.sites.find((s) => s.id === activeId.value)?.color ?? '',
+)
+
+const mergedGroupClass = computed(() =>
+  twMerge(
+    'flex w-full',
+    props.groupClass,
+  ),
+)
+
+const mergedTileClass = computed(() =>
+  twMerge(
+    'flex-1 cursor-pointer px-6 py-4 text-center transition-opacity focus:outline-none',
+    props.tileClass,
+  ),
+)
+
+const mergedLabelClass = computed(() =>
+  twMerge(
+    'text-white font-bold uppercase tracking-wide',
+    props.labelClass,
+  ),
+)
+
+function select(id: string) {
+  const site = props.sites.find((s) => s.id === id)
+  if (!site) return
+
+  if (!isControlled.value) {
+    localValue.value = id
+  }
+  emit('update:modelValue', id)
+  emit('change', site)
+}
+</script>
diff --git a/app/story/site/siteSelector.story.vue b/app/story/site/siteSelector.story.vue
new file mode 100644
index 0000000..b8a4157
--- /dev/null
+++ b/app/story/site/siteSelector.story.vue
@@ -0,0 +1,116 @@
+<template>
+  <Story title="Site/Selector">
+    <div class="grid grid-cols-1 gap-6">
+      <div class="rounded-lg border p-4">
+        <h2 class="mb-4 text-xl font-bold">Trois sites</h2>
+        <MalioSiteSelector v-model="threeValue" :sites="sites" />
+        <p class="mt-3 text-sm text-gray-600">Site sélectionné : <code>{{ threeValue }}</code></p>
+      </div>
+
+      <div class="rounded-lg border p-4">
+        <h2 class="mb-4 text-xl font-bold">Deux sites</h2>
+        <MalioSiteSelector v-model="twoValue" :sites="sitesTwo" />
+      </div>
+
+      <div class="rounded-lg border p-4">
+        <h2 class="mb-4 text-xl font-bold">Cinq sites</h2>
+        <MalioSiteSelector v-model="fiveValue" :sites="sitesFive" />
+      </div>
+
+      <div class="rounded-lg border p-4">
+        <h2 class="mb-4 text-xl font-bold">Non contrôlé</h2>
+        <MalioSiteSelector :sites="sites" />
+      </div>
+    </div>
+  </Story>
+</template>
+
+<docs lang="md">
+# MalioSiteSelector
+
+Sélecteur horizontal pour choisir **un site** (usine ou lieu) parmi une liste. Les tuiles occupent une largeur proportionnelle du conteneur. La couleur du site sélectionné est appliquée à toutes les tuiles ; la tuile active est opaque (opacité 1), les autres sont atténuées (opacité 0.4).
+
+---
+
+## Props détaillées
+
+### sites
+
+- Type : `Array<{ id: string; name: string; color: string }>`
+- Requis : oui
+- Description : Liste des sites à afficher. `color` est un hex (ex : `'#0055ff'`). La couleur du site actuellement sélectionné est appliquée à toutes les tuiles.
+
+### modelValue
+
+- Type : `string`
+- Description : `id` du site sélectionné (v-model). Sans `v-model`, le premier site est sélectionné par défaut (mode non contrôlé).
+
+### id
+
+- Type : `string`
+- Description : Identifiant HTML du conteneur. Auto-généré si absent.
+
+### groupClass / tileClass / labelClass
+
+- Type : `string`
+- Description : Classes Tailwind additionnelles fusionnées via `twMerge` sur, respectivement, le conteneur `<div role="radiogroup">`, chaque tuile et le libellé.
+
+---
+
+## Comportement
+
+- **Toujours un site sélectionné.** Re-cliquer sur la tuile active ne la désélectionne pas.
+- **Couleur partagée.** Le `background-color` de toutes les tuiles suit la couleur du site sélectionné. Changer de site met à jour instantanément la couleur de la bande.
+- **Pas de gestion d'overflow** : les tuiles se répartissent proportionnellement sur toute la largeur disponible.
+
+---
+
+## Accessibilité
+
+- `role="radiogroup"` sur le conteneur.
+- `role="radio"` avec `aria-checked` sur chaque tuile.
+- Roving `tabindex` : la tuile active est focusable (`tabindex="0"`), les autres sont exclues du tab order (`tabindex="-1"`).
+- Activation par Enter/Space via l'élément `<button>`.
+
+---
+
+## Events
+
+### update:modelValue
+
+- Émis au clic sur une tuile.
+- Retourne l'`id` (`string`) du site sélectionné.
+
+### change
+
+- Émis au clic sur une tuile, en complément de `update:modelValue`.
+- Retourne l'objet `Site` complet (`{ id, name, color }`) — utile pour déclencher des actions (appel API, filtrage…) sans avoir à relire le tableau `sites` côté consommateur.
+</docs>
+
+<script setup lang="ts">
+import { ref } from 'vue'
+import MalioSiteSelector from '../../components/malio/site/SiteSelector.vue'
+
+const sites = [
+  { id: 'chatellerault', name: 'Châtellerault', color: '#0055ff' },
+  { id: 'saint-jean', name: 'Saint-Jean', color: '#16a34a' },
+  { id: 'pommevic', name: 'Pommevic', color: '#dc2626' },
+]
+
+const sitesTwo = [
+  { id: 'nord', name: 'Usine Nord', color: '#7c3aed' },
+  { id: 'sud', name: 'Usine Sud', color: '#ea580c' },
+]
+
+const sitesFive = [
+  { id: 's1', name: 'Site 1', color: '#0ea5e9' },
+  { id: 's2', name: 'Site 2', color: '#14b8a6' },
+  { id: 's3', name: 'Site 3', color: '#f59e0b' },
+  { id: 's4', name: 'Site 4', color: '#ec4899' },
+  { id: 's5', name: 'Site 5', color: '#6366f1' },
+]
+
+const threeValue = ref('chatellerault')
+const twoValue = ref('nord')
+const fiveValue = ref('s3')
+</script>