diff --git a/app/models/concerns/tags_substitution_concern.rb b/app/models/concerns/tags_substitution_concern.rb
index 1162beb0e..390555775 100644
--- a/app/models/concerns/tags_substitution_concern.rb
+++ b/app/models/concerns/tags_substitution_concern.rb
@@ -40,6 +40,12 @@ module TagsSubstitutionConcern
       description: '',
       target: :id,
       available_for_states: Dossier::SOUMIS
+    },
+    {
+      libelle: 'nom du service',
+      description: 'Le nom du service instructeur qui traite le dossier',
+      lambda: -> (d) { d.procedure.organisation_name || '' },
+      available_for_states: Dossier::SOUMIS
     }
   ]
 
diff --git a/spec/models/concern/tags_substitution_concern_spec.rb b/spec/models/concern/tags_substitution_concern_spec.rb
index b2a640214..6ae053824 100644
--- a/spec/models/concern/tags_substitution_concern_spec.rb
+++ b/spec/models/concern/tags_substitution_concern_spec.rb
@@ -4,12 +4,16 @@ describe TagsSubstitutionConcern, type: :model do
   let(:for_individual) { false }
   let(:state) { Dossier.states.fetch(:accepte) }
 
+  let(:service) { create(:service, nom: 'Service instructeur') }
+
   let(:procedure) do
     create(:procedure,
       libelle: 'Une magnifique démarche',
       types_de_champ: types_de_champ,
       types_de_champ_private: types_de_champ_private,
-      for_individual: for_individual)
+      for_individual: for_individual,
+      service: service,
+      organisation: nil)
   end
 
   let(:template_concern) do
@@ -144,6 +148,19 @@ describe TagsSubstitutionConcern, type: :model do
       end
     end
 
+    context 'when the user requests the service' do
+      let(:template) { 'Dossier traité par --nom du service--' }
+
+      context 'and there is a service' do
+        it { is_expected.to eq("Dossier traité par #{service.nom}") }
+      end
+
+      context 'and there is no service yet' do
+        let(:service) { nil }
+        it { is_expected.to eq("Dossier traité par ") }
+      end
+    end
+
     context 'when the dossier has a motivation' do
       let(:dossier) { create(:dossier, motivation: 'motivation') }