diff --git a/app/graphql/api/v2/stored_query.rb b/app/graphql/api/v2/stored_query.rb
index 5b5a5b6be..80177c1d3 100644
--- a/app/graphql/api/v2/stored_query.rb
+++ b/app/graphql/api/v2/stored_query.rb
@@ -801,5 +801,17 @@ class API::V2::StoredQuery
       }
     }
   }
+
+  mutation demarcheCloner($input: DemarcheClonerInput!) {
+    demarcheCloner(input: $input) {
+      demarche {
+        id
+        number
+      }
+      errors {
+        message
+      }
+    }
+  }
   GRAPHQL
 end
diff --git a/app/graphql/mutations/demarche_cloner.rb b/app/graphql/mutations/demarche_cloner.rb
new file mode 100644
index 000000000..86bd03ff2
--- /dev/null
+++ b/app/graphql/mutations/demarche_cloner.rb
@@ -0,0 +1,25 @@
+module Mutations
+  class DemarcheCloner < Mutations::BaseMutation
+    description "Cloner une démarche."
+
+    argument :demarche, Types::DemarcheDescriptorType::FindDemarcheInput, "La démarche", required: true
+    argument :title, String, "Le titre de la nouvelle démarche.", required: false
+
+    field :demarche, Types::DemarcheDescriptorType, null: true
+    field :errors, [Types::ValidationErrorType], null: true
+
+    def resolve(demarche:, title: nil)
+      demarche_number = demarche.number.presence || ApplicationRecord.id_from_typed_id(demarche.id)
+      demarche = Procedure.find_by(id: demarche_number)
+
+      if demarche.present? && (demarche.opendata? || context.authorized_demarche?(demarche))
+        cloned_demarche = demarche.clone(context.current_administrateur, false)
+        cloned_demarche.update!(libelle: title) if title.present?
+
+        { demarche: cloned_demarche.draft_revision }
+      else
+        { errors: ["La démarche \"#{demarche_number}\" ne peut pas être clonée."] }
+      end
+    end
+  end
+end
diff --git a/app/graphql/schema.graphql b/app/graphql/schema.graphql
index 748e15141..41fce971b 100644
--- a/app/graphql/schema.graphql
+++ b/app/graphql/schema.graphql
@@ -595,6 +595,38 @@ type Demarche {
   title: String!
 }
 
+"""
+Autogenerated input type of DemarcheCloner
+"""
+input DemarcheClonerInput {
+  """
+  A unique identifier for the client performing the mutation.
+  """
+  clientMutationId: String
+
+  """
+  La démarche
+  """
+  demarche: FindDemarcheInput!
+
+  """
+  Le titre de la nouvelle démarche.
+  """
+  title: String
+}
+
+"""
+Autogenerated return type of DemarcheCloner.
+"""
+type DemarcheClonerPayload {
+  """
+  A unique identifier for the client performing the mutation.
+  """
+  clientMutationId: String
+  demarche: DemarcheDescriptor
+  errors: [ValidationError!]
+}
+
 """
 Une démarche (métadonnées)
 Ceci est une version abrégée du type `Demarche`, qui n’expose que les métadonnées.
@@ -1922,6 +1954,16 @@ type Mutation {
     input: CreateDirectUploadInput!
   ): CreateDirectUploadPayload
 
+  """
+  Cloner une démarche.
+  """
+  demarcheCloner(
+    """
+    Parameters for DemarcheCloner
+    """
+    input: DemarcheClonerInput!
+  ): DemarcheClonerPayload
+
   """
   Accepter le dossier.
   """
diff --git a/app/graphql/types/mutation_type.rb b/app/graphql/types/mutation_type.rb
index f01bca909..ce2f8ac56 100644
--- a/app/graphql/types/mutation_type.rb
+++ b/app/graphql/types/mutation_type.rb
@@ -23,5 +23,6 @@ module Types
     field :groupe_instructeur_creer, mutation: Mutations::GroupeInstructeurCreer
     field :groupe_instructeur_ajouter_instructeurs, mutation: Mutations::GroupeInstructeurAjouterInstructeurs
     field :groupe_instructeur_supprimer_instructeurs, mutation: Mutations::GroupeInstructeurSupprimerInstructeurs
+    field :demarche_cloner, mutation: Mutations::DemarcheCloner
   end
 end
diff --git a/spec/controllers/api/v2/graphql_controller_stored_queries_spec.rb b/spec/controllers/api/v2/graphql_controller_stored_queries_spec.rb
index eec532f1b..9dfcf0330 100644
--- a/spec/controllers/api/v2/graphql_controller_stored_queries_spec.rb
+++ b/spec/controllers/api/v2/graphql_controller_stored_queries_spec.rb
@@ -367,5 +367,45 @@ describe API::V2::GraphqlController do
         expect(gql_data[:groupeInstructeurSupprimerInstructeurs][:groupeInstructeur][:instructeurs]).to eq([{ id: existing_instructeur.to_typed_id, email: existing_instructeur.email }])
       }
     end
+
+    context 'demarcheCloner' do
+      let(:operation_name) { 'demarcheCloner' }
+
+      context 'find by number' do
+        let(:variables) { { input: { demarche: { number: procedure.id } } } }
+
+        it {
+          expect(gql_errors).to be_nil
+          expect(gql_data[:demarcheCloner][:errors]).to be_nil
+          expect(gql_data[:demarcheCloner][:demarche][:id]).not_to be_nil
+          expect(gql_data[:demarcheCloner][:demarche][:id]).not_to eq(procedure.to_typed_id)
+          expect(gql_data[:demarcheCloner][:demarche][:id]).to eq(Procedure.last.to_typed_id)
+        }
+      end
+
+      context 'find by id' do
+        let(:variables) { { input: { demarche: { id: procedure.to_typed_id } } } }
+
+        it {
+          expect(gql_errors).to be_nil
+          expect(gql_data[:demarcheCloner][:errors]).to be_nil
+          expect(gql_data[:demarcheCloner][:demarche][:id]).not_to be_nil
+          expect(gql_data[:demarcheCloner][:demarche][:id]).not_to eq(procedure.to_typed_id)
+          expect(gql_data[:demarcheCloner][:demarche][:id]).to eq(Procedure.last.to_typed_id)
+        }
+      end
+
+      context 'with title' do
+        let(:variables) { { input: { demarche: { id: procedure.to_typed_id }, title: new_title } } }
+        let(:new_title) { "#{procedure.libelle} TEST 1" }
+
+        it {
+          expect(gql_errors).to be_nil
+          expect(gql_data[:demarcheCloner][:errors]).to be_nil
+          expect(gql_data[:demarcheCloner][:demarche][:id]).to eq(Procedure.last.to_typed_id)
+          expect(Procedure.last.libelle).to eq(new_title)
+        }
+      end
+    end
   end
 end