diff --git a/app_new/__init__.py b/app_new/__init__.py
index 098ecb7..43cf9d7 100644
--- a/app_new/__init__.py
+++ b/app_new/__init__.py
@@ -62,6 +62,12 @@ def create_app(config_name='default'):
     config_class = config_dict[config_name]
     app.config.from_object(config_class)
     config_class.init_app(app)
+
+    # Affiché notamment dans le setup wizard afin d'identifier sans ambiguïté
+    # le code réellement exécuté par un conteneur, même avant installation.
+    from .core.build_info import get_build_commit
+    app.config['GIT_COMMIT'] = get_build_commit()
+    app.context_processor(lambda: {'build_commit': app.config['GIT_COMMIT']})
     
     # Initialisation des extensions
     db.init_app(app)
diff --git a/app_new/core/build_info.py b/app_new/core/build_info.py
new file mode 100644
index 0000000..8005dc2
--- /dev/null
+++ b/app_new/core/build_info.py
@@ -0,0 +1,33 @@
+"""Informations sur le build actuellement exécuté."""
+
+import os
+import subprocess
+from pathlib import Path
+
+
+def get_build_commit():
+    """Retourne l'identifiant du commit déployé.
+
+    En production, le dépôt Git n'est pas forcément présent dans l'image :
+    les variables d'environnement sont donc prioritaires. Le fallback Git
+    permet de conserver un affichage utile en développement.
+    """
+    for variable in ("GIT_COMMIT", "COMMIT_SHA", "SOURCE_VERSION"):
+        value = (os.environ.get(variable) or "").strip()
+        if value:
+            return value
+
+    repository = Path(__file__).resolve().parents[2]
+    try:
+        result = subprocess.run(
+            ["git", "rev-parse", "HEAD"],
+            cwd=repository,
+            check=True,
+            capture_output=True,
+            text=True,
+            timeout=1,
+        )
+    except (OSError, subprocess.SubprocessError):
+        return "inconnu"
+    commit = result.stdout.strip()
+    return commit or "inconnu"
diff --git a/app_new/templates/setup_wizard/index.html b/app_new/templates/setup_wizard/index.html
index 196f692..d373e82 100644
--- a/app_new/templates/setup_wizard/index.html
+++ b/app_new/templates/setup_wizard/index.html
@@ -6,6 +6,7 @@
   <div class="card shadow mx-auto" style="max-width: 1200px">
     <div class="card-header bg-primary text-white">
       <h4 class="mb-0"><i class="bi bi-gear-fill"></i> Configuration initiale GMAO</h4>
+      <div class="small mt-1 opacity-75">Commit déployé : <code class="text-white">{{ build_commit }}</code></div>
     </div>
     <div class="card-body">
       <div class="d-flex flex-wrap justify-content-between gap-2 mb-4" id="stepIndicators">
diff --git a/app_new/templates/setup_wizard/setup_complete.html b/app_new/templates/setup_wizard/setup_complete.html
index a837134..51edb31 100644
--- a/app_new/templates/setup_wizard/setup_complete.html
+++ b/app_new/templates/setup_wizard/setup_complete.html
@@ -10,6 +10,7 @@
                     <i class="bi bi-check-circle-fill text-success" style="font-size: 4rem;"></i>
                     <h2 class="mt-4">Configuration terminée</h2>
                     <p class="text-muted">Le système GMAO a déjà été configuré.</p>
+                    <p class="small text-muted mb-0">Commit déployé : <code>{{ build_commit }}</code></p>
                     <a href="{{ url_for('companies.index') }}" class="btn btn-primary mt-3">
                         <i class="bi bi-house"></i> Accueil
                     </a>
@@ -18,4 +19,4 @@
         </div>
     </div>
 </div>
-{% endblock %}
\ No newline at end of file
+{% endblock %}
diff --git a/tests/integration/test_auth_setup.py b/tests/integration/test_auth_setup.py
index b2a7077..dc927b8 100644
--- a/tests/integration/test_auth_setup.py
+++ b/tests/integration/test_auth_setup.py
@@ -1,6 +1,33 @@
 from pathlib import Path
 
 
+def test_build_commit_prefers_deployment_environment(monkeypatch):
+    from app_new.core.build_info import get_build_commit
+
+    monkeypatch.setenv('GIT_COMMIT', 'commit-deploye-test')
+    monkeypatch.setenv('COMMIT_SHA', 'autre-commit')
+    assert get_build_commit() == 'commit-deploye-test'
+
+
+def test_setup_pages_display_build_commit(client, monkeypatch, tmp_path):
+    from app_new.core.routes import setup_wizard
+
+    monkeypatch.setattr(setup_wizard, 'DATA_DIR', str(tmp_path))
+    monkeypatch.setenv('GIT_COMMIT', 'commit-visible-test')
+    client.application.config['GIT_COMMIT'] = 'commit-visible-test'
+    token = 'test-setup-token-with-at-least-32-characters'
+
+    response = client.get(f'/setup-wizard/?token={token}')
+    assert response.status_code == 302
+    response = client.get('/setup-wizard/')
+    assert b'commit-visible-test' in response.data
+
+    Path(tmp_path, '.setup_complete').write_text('complete', encoding='utf-8')
+    response = client.get('/setup-wizard/')
+    assert response.status_code == 200
+    assert b'commit-visible-test' in response.data
+
+
 def test_login_page_does_not_disclose_demo_passwords(client):
     response = client.get('/auth/login')
     assert response.status_code == 200