diff --git a/app/controllers/backoffice/dossiers_controller.rb b/app/controllers/backoffice/dossiers_controller.rb
index 88b4fd83e..267b5cfee 100644
--- a/app/controllers/backoffice/dossiers_controller.rb
+++ b/app/controllers/backoffice/dossiers_controller.rb
@@ -159,6 +159,15 @@ class Backoffice::DossiersController < Backoffice::DossiersListController
     redirect_to backoffice_dossiers_path
   end
 
+  def reopen
+    create_dossier_facade params[:dossier_id]
+
+    @facade.dossier.initiated!
+    flash.notice = 'Dossier réouvert.'
+
+    redirect_to backoffice_dossiers_path
+  end
+
   private
 
   def create_dossier_facade dossier_id
diff --git a/app/views/layouts/left_panels/_left_panel_backoffice_dossierscontroller_show.html.haml b/app/views/layouts/left_panels/_left_panel_backoffice_dossierscontroller_show.html.haml
index 13a482ccc..43dbfac81 100644
--- a/app/views/layouts/left_panels/_left_panel_backoffice_dossierscontroller_show.html.haml
+++ b/app/views/layouts/left_panels/_left_panel_backoffice_dossierscontroller_show.html.haml
@@ -17,6 +17,7 @@
       = form_tag(url_for({controller: 'backoffice/dossiers', action: :refuse, dossier_id: @facade.dossier.id}), class: 'form-inline action_button', method: 'POST', style: 'display:inline', 'data-toggle' => :tooltip, title: 'Refuser') do
         %button.action.refuse-dossier
           %i.fa.fa-times
+      = link_to 'Reouvrir', backoffice_dossier_reopen_path(@facade.dossier), method: :post, class: 'btn btn-default btn-block'
 
     - unless @facade.dossier.archived?
       = link_to 'Archiver', backoffice_dossier_archive_path(@facade.dossier), method: :post, class: 'btn btn-default btn-block'
diff --git a/config/routes.rb b/config/routes.rb
index dfffb56eb..1c3f99b72 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -163,6 +163,7 @@ Rails.application.routes.draw do
       post 'without_continuation' => 'dossiers#without_continuation'
       post 'close' => 'dossiers#close'
       post 'archive' => 'dossiers#archive'
+      post 'reopen' => 'dossiers#reopen'
 
       put 'follow' => 'dossiers#follow'
       resources :commentaires, only: [:index]
diff --git a/spec/controllers/backoffice/dossiers_controller_spec.rb b/spec/controllers/backoffice/dossiers_controller_spec.rb
index a73cfddff..3d0043ea6 100644
--- a/spec/controllers/backoffice/dossiers_controller_spec.rb
+++ b/spec/controllers/backoffice/dossiers_controller_spec.rb
@@ -357,6 +357,23 @@ describe Backoffice::DossiersController, type: :controller do
     end
   end
 
+  describe 'POST #reopen' do
+    before do
+      dossier.received!
+      sign_in gestionnaire
+    end
+
+    subject { post :reopen, params: {dossier_id: dossier_id} }
+
+    it 'change state to initiated' do
+      subject
+
+      dossier.reload
+      expect(dossier.state).to eq('initiated')
+    end
+
+    it { is_expected.to redirect_to backoffice_dossiers_path }
+  end
 
   describe 'POST #archive' do
     before do