diff --git a/app/components/editable_champ/siret_component/siret_component.html.haml b/app/components/editable_champ/siret_component/siret_component.html.haml
index 9e0745c79..456afd069 100644
--- a/app/components/editable_champ/siret_component/siret_component.html.haml
+++ b/app/components/editable_champ/siret_component/siret_component.html.haml
@@ -1,4 +1,4 @@
-= @form.text_field(:value, input_opts(id: @champ.input_id, aria: { describedby: @champ.describedby_id }, data: { controller: 'turbo-input', turbo_input_load_on_connect_value: @champ.prefilled? && @champ.value.present? && @champ.etablissement.blank?, turbo_input_url_value: update_path }, required: @champ.required?, pattern: "[0-9]{14}", class: "width-33-desktop", maxlength: 14))
+= @form.text_field(:value, input_opts(id: @champ.input_id, aria: { describedby: @champ.describedby_id }, data: { controller: 'turbo-input format', format: 'siret', turbo_input_load_on_connect_value: @champ.prefilled? && @champ.value.present? && @champ.etablissement.blank?, turbo_input_url_value: update_path }, required: @champ.required?, class: "width-33-desktop"))
 .siret-info{ id: dom_id(@champ, :siret_info) }
   - if @champ.etablissement.present?
     = render EditableChamp::EtablissementTitreComponent.new(etablissement: @champ.etablissement)
diff --git a/app/javascript/controllers/format_controller.ts b/app/javascript/controllers/format_controller.ts
index d5712d46e..9eacd690e 100644
--- a/app/javascript/controllers/format_controller.ts
+++ b/app/javascript/controllers/format_controller.ts
@@ -11,6 +11,13 @@ export class FormatController extends ApplicationController {
           replaceValue(target, value);
         });
         break;
+      case 'siret':
+        this.on('input', (event) => {
+          const target = event.target as HTMLInputElement;
+          const value = this.formatSIRET(target.value);
+          replaceValue(target, value);
+        });
+        break;
       case 'iban':
         this.on('input', (event) => {
           const target = event.target as HTMLInputElement;
@@ -38,7 +45,12 @@ export class FormatController extends ApplicationController {
   private formatList(value: string) {
     return value.replace(/;/g, ',');
   }
-
+  private formatSIRET(value: string) {
+    return value
+      .replace(/[^\d]/gi, '')
+      .replace(/^\s*(\d{3})\s*(\d{3})\s*(\d{3})\s*(\d{5})\s*$/gi, '$1 $2 $3 $4')
+      .trim();
+  }
   private formatIBAN(value: string) {
     return value
       .replace(/[^\dA-Z]/gi, '')
diff --git a/config/locales/models/champs/siret_champ/en.yml b/config/locales/models/champs/siret_champ/en.yml
index 4fa59a07e..a4104f3be 100644
--- a/config/locales/models/champs/siret_champ/en.yml
+++ b/config/locales/models/champs/siret_champ/en.yml
@@ -3,4 +3,4 @@ en:
     attributes:
       champs/siret_champ:
         hints:
-          value: "Enter 14 digits, no space. Example : 50000123456789"
+          value: "Enter 14 digits. Example : 500 0012 345 6789"
diff --git a/config/locales/models/champs/siret_champ/fr.yml b/config/locales/models/champs/siret_champ/fr.yml
index 2c8f73bdc..d38d7b591 100644
--- a/config/locales/models/champs/siret_champ/fr.yml
+++ b/config/locales/models/champs/siret_champ/fr.yml
@@ -3,4 +3,4 @@ fr:
     attributes:
       champs/siret_champ:
         hints:
-          value: "Saisissez 14 chiffres sans espaces. Exemple : 50000123456789"
+          value: "Saisissez 14 chiffres. Exemple : 500 001 234 56789"