diff --git a/server/src/customEmailTemplate.js b/server/src/customEmailTemplate.js
index 963b35a..d2fd1ad 100644
--- a/server/src/customEmailTemplate.js
+++ b/server/src/customEmailTemplate.js
@@ -73,7 +73,7 @@ export function buildCustomEmail({ content, baseUrl, association = {} }) {
   ${content.signature ? `<tr><td style="padding:24px 40px 38px;font-family:Georgia,'Times New Roman',serif;font-size:16px;line-height:26px;color:#1B1B1B;">${lines(content.signature)}</td></tr>` : '<tr><td height="26" style="height:26px;line-height:26px;">&nbsp;</td></tr>'}
   <tr><td bgcolor="#0F0E0D" style="background-color:#0F0E0D;padding:24px 40px;font-family:Arial,Helvetica,sans-serif;font-size:12px;color:#B7AFA6;line-height:22px;">
     ${esc(settings.association_name)}${settings.association_address ? ` &middot; ${lines(settings.association_address)}` : ''}<br>
-    ${settings.association_contact ? `${esc(settings.association_contact)} &middot; ` : ''}${settings.association_email ? `<a href="mailto:${esc(settings.association_email)}" style="color:#E0777A;text-decoration:none;">${esc(settings.association_email)}</a>` : ''}${settings.association_phone ? ` &middot; ${esc(settings.association_phone)}` : ''}
+    ${settings.association_contact ? `${esc(settings.association_contact)} &middot; ` : ''}${settings.association_email ? `<a href="mailto:${esc(settings.association_email)}" style="color:#E0777A;text-decoration:none;">${esc(settings.association_email)}</a>` : ''}${settings.association_phone ? ` &middot; ${esc(settings.association_phone)}` : ''}${settings.association_siret ? `<br>SIRET&nbsp;: ${esc(settings.association_siret)}` : ''}
   </td></tr>
 </table>
 <!--[if mso]></td></tr></table><![endif]-->
diff --git a/server/src/emailTemplate.js b/server/src/emailTemplate.js
index 10bb2a1..95b17da 100644
--- a/server/src/emailTemplate.js
+++ b/server/src/emailTemplate.js
@@ -157,7 +157,7 @@ export function buildInvitationEmail({ rencontre, baseUrl, texts = {}, associati
 
   <tr><td bgcolor="#0F0E0D" style="background-color:#0F0E0D;padding:24px 40px;font-family:Arial,Helvetica,sans-serif;font-size:12px;color:#B7AFA6;line-height:22px;">
     ${esc(settings.association_name)}${settings.association_address ? ` &middot; ${escML(settings.association_address)}` : ''}<br>
-    ${settings.association_contact ? `${esc(settings.association_contact)} &middot; ` : ''}${settings.association_email ? `<a href="mailto:${esc(settings.association_email)}" style="color:#E0777A;text-decoration:none;">${esc(settings.association_email)}</a>` : ''}${settings.association_phone ? ` &middot; ${esc(settings.association_phone)}` : ''}
+    ${settings.association_contact ? `${esc(settings.association_contact)} &middot; ` : ''}${settings.association_email ? `<a href="mailto:${esc(settings.association_email)}" style="color:#E0777A;text-decoration:none;">${esc(settings.association_email)}</a>` : ''}${settings.association_phone ? ` &middot; ${esc(settings.association_phone)}` : ''}${settings.association_siret ? `<br>SIRET&nbsp;: ${esc(settings.association_siret)}` : ''}
   </td></tr>
 
 </table>
diff --git a/server/src/schemas.js b/server/src/schemas.js
index 448c19d..954cad6 100644
--- a/server/src/schemas.js
+++ b/server/src/schemas.js
@@ -1,6 +1,10 @@
 import { z } from 'zod';
 
 const trimmed = (max, min = 0) => z.string().trim().min(min).max(max);
+const siret = z.string().trim().max(20).refine(
+  (value) => !value || /^\d{14}$/.test(value.replace(/\s/g, '')),
+  'doit contenir exactement 14 chiffres'
+);
 
 export const idParam = z.object({ id: z.coerce.number().int().positive() });
 
@@ -100,6 +104,7 @@ export const contentSchema = z.object({
   association_address: trimmed(500).optional(),
   association_email: trimmed(254).email().or(z.literal('')).optional(),
   association_phone: trimmed(40).optional(),
+  association_siret: siret.optional(),
   association_contact: trimmed(160).optional(),
   association_website: z.string().trim().url().max(300).or(z.literal('')).optional(),
   association_facebook_url: z.string().trim().url().max(500).or(z.literal('')).optional(),
diff --git a/server/src/siteSettings.js b/server/src/siteSettings.js
index 0913ef4..8ae36ca 100644
--- a/server/src/siteSettings.js
+++ b/server/src/siteSettings.js
@@ -3,6 +3,7 @@ export const ASSOCIATION_DEFAULTS = {
   association_address: 'Palais des Sports Jean Weille\nNancy (54)',
   association_email: 'contact@sluc-businessclub.fr',
   association_phone: '+33 3 83 00 00 00',
+  association_siret: '',
   association_contact: '',
   association_website: '',
   association_facebook_url: 'https://www.facebook.com/search/top?q=sluc%20business%20club',
diff --git a/server/src/sql/seed.sql b/server/src/sql/seed.sql
index 4488be4..198985c 100644
--- a/server/src/sql/seed.sql
+++ b/server/src/sql/seed.sql
@@ -63,6 +63,7 @@ INSERT INTO site_content (key, value) VALUES
   ('association_address', E'Palais des Sports Jean Weille\nNancy (54)'),
   ('association_email', 'contact@sluc-businessclub.fr'),
   ('association_phone', '+33 3 83 00 00 00'),
+  ('association_siret', ''),
   ('association_contact', ''),
   ('association_website', ''),
   ('association_facebook_url', 'https://www.facebook.com/search/top?q=sluc%20business%20club'),
diff --git a/web/src/components/Footer.jsx b/web/src/components/Footer.jsx
index 62f2be0..4751023 100644
--- a/web/src/components/Footer.jsx
+++ b/web/src/components/Footer.jsx
@@ -49,6 +49,7 @@ export default function Footer() {
             {settings.association_contact && <span>{settings.association_contact}</span>}
             {settings.association_email && <a href={`mailto:${settings.association_email}`} style={linkStyle}>{settings.association_email}</a>}
             {settings.association_phone && <a href={`tel:${settings.association_phone.replace(/[^+\d]/g, '')}`} style={linkStyle}>{settings.association_phone}</a>}
+            {settings.association_siret && <span>SIRET : {settings.association_siret}</span>}
             {settings.association_website && <a href={settings.association_website} target="_blank" rel="noopener noreferrer" style={linkStyle}>Site web</a>}
           </div>
         </div>
diff --git a/web/src/components/admin/AdminContent.jsx b/web/src/components/admin/AdminContent.jsx
index 918a037..f96dc7d 100644
--- a/web/src/components/admin/AdminContent.jsx
+++ b/web/src/components/admin/AdminContent.jsx
@@ -251,6 +251,20 @@ export function ParametresTab() {
               <input name="association_phone" type="tel" value={settings.association_phone} onChange={onChange} maxLength={40} />
             </label>
           </div>
+          <label className="field">SIRET
+            <input
+              name="association_siret"
+              value={settings.association_siret}
+              onChange={onChange}
+              inputMode="numeric"
+              maxLength={20}
+              placeholder="14 chiffres"
+              aria-describedby="association-siret-help"
+            />
+            <span id="association-siret-help" style={{ marginTop: 5, fontSize: 11.5, color: 'var(--gray-light)', fontWeight: 400 }}>
+              Les espaces sont acceptés; le numéro doit contenir exactement 14 chiffres.
+            </span>
+          </label>
           <div className="grid-2" style={{ gap: 12 }}>
             <label className="field">Contact principal
               <input name="association_contact" value={settings.association_contact} onChange={onChange} maxLength={160} placeholder="Nom et fonction" />
diff --git a/web/src/lib/siteSettings.js b/web/src/lib/siteSettings.js
index 0913ef4..8ae36ca 100644
--- a/web/src/lib/siteSettings.js
+++ b/web/src/lib/siteSettings.js
@@ -3,6 +3,7 @@ export const ASSOCIATION_DEFAULTS = {
   association_address: 'Palais des Sports Jean Weille\nNancy (54)',
   association_email: 'contact@sluc-businessclub.fr',
   association_phone: '+33 3 83 00 00 00',
+  association_siret: '',
   association_contact: '',
   association_website: '',
   association_facebook_url: 'https://www.facebook.com/search/top?q=sluc%20business%20club',
diff --git a/web/src/pages/Association.jsx b/web/src/pages/Association.jsx
index 6d76c8f..e79f303 100644
--- a/web/src/pages/Association.jsx
+++ b/web/src/pages/Association.jsx
@@ -35,7 +35,7 @@ export default function Association() {
     .map((name) => name.trim())
     .filter(Boolean);
   const hasContact = settings.association_address || settings.association_email
-    || settings.association_phone || settings.association_contact;
+    || settings.association_phone || settings.association_contact || settings.association_siret;
 
   return (
     <main>
@@ -147,6 +147,7 @@ export default function Association() {
               {settings.association_address && <span style={{ whiteSpace: 'pre-line', color: 'var(--gray)' }}>{settings.association_address}</span>}
               {settings.association_email && <a className="btn-link" href={`mailto:${settings.association_email}`}>{settings.association_email}</a>}
               {settings.association_phone && <a className="btn-link" href={`tel:${settings.association_phone.replace(/[^+\d]/g, '')}`}>{settings.association_phone}</a>}
+              {settings.association_siret && <span style={{ color: 'var(--gray)' }}>SIRET : {settings.association_siret}</span>}
             </div>
           </div>
         </section>