diff --git a/app/controllers/manager/administrateurs_controller.rb b/app/controllers/manager/administrateurs_controller.rb
index 53f436f30..befabd759 100644
--- a/app/controllers/manager/administrateurs_controller.rb
+++ b/app/controllers/manager/administrateurs_controller.rb
@@ -22,10 +22,15 @@ module Manager
     def delete
       administrateur = Administrateur.find(params[:id])
 
-      administrateur.delete_and_transfer_services
+      result = AdministrateurDeletionService.new(current_super_admin, administrateur).call
 
-      logger.info("L'administrateur #{administrateur.id} est supprimé par #{current_super_admin.id}")
-      flash[:notice] = "L'administrateur #{administrateur.id} est supprimé"
+      case result
+      in Dry::Monads::Result::Success
+        logger.info("L'administrateur #{administrateur.id} est supprimé par #{current_super_admin.id}")
+        flash[:notice] = "L'administrateur #{administrateur.id} est supprimé"
+      in Dry::Monads::Result::Failure(reason)
+        flash[:alert] = I18n.t(reason, scope: "manager.administrateurs.delete")
+      end
 
       redirect_to manager_administrateurs_path
     end
diff --git a/app/models/administrateur.rb b/app/models/administrateur.rb
index 0f6e1e6de..e0af22bbc 100644
--- a/app/models/administrateur.rb
+++ b/app/models/administrateur.rb
@@ -70,7 +70,7 @@ class Administrateur < ApplicationRecord
   end
 
   def can_be_deleted?
-    procedures.all? { |p| p.administrateurs.count > 1 }
+    procedures.all? { |p| p.administrateurs.count > 1 || p.dossiers.empty? }
   end
 
   def delete_and_transfer_services
diff --git a/app/services/administrateur_deletion_service.rb b/app/services/administrateur_deletion_service.rb
new file mode 100644
index 000000000..0b4809384
--- /dev/null
+++ b/app/services/administrateur_deletion_service.rb
@@ -0,0 +1,65 @@
+class AdministrateurDeletionService
+  include Dry::Monads[:result]
+
+  attr_reader :super_admin, :admin, :owned_procedures, :shared_procedures
+
+  def initialize(super_admin, admin)
+    @super_admin = super_admin
+    @admin = admin
+    @owned_procedures, @shared_procedures = admin
+      .procedures
+      .with_discarded
+      .partition { _1.administrateurs.one? }
+  end
+
+  def call
+    return Failure(:cannot_be_deleted) unless admin.can_be_deleted?
+
+    result = nil
+
+    ApplicationRecord.transaction do
+      delete_admin_from_shared_procedures
+      delete_procedures_without_dossier
+
+      if admin.procedures.with_discarded.count.positive?
+        result = Failure(:still_procedures)
+        raise ActiveRecord::Rollback
+      end
+
+      delete_services_without_procedures
+      transfer_services
+      if admin.services.count.positive?
+        result = Failure(:still_services)
+        raise ActiveRecord::Rollback
+      end
+
+      admin.destroy!
+      result = Success(:ok)
+    end
+    result
+  end
+
+  private
+
+  def delete_admin_from_shared_procedures
+    @shared_procedures.each { _1.administrateurs.delete(admin) }
+  end
+
+  def delete_procedures_without_dossier
+    procedures_without_dossier = owned_procedures.filter { _1.dossiers.empty? }
+    procedures_without_dossier.each { _1.discard_and_keep_track!(super_admin) }
+    procedures_without_dossier.each(&:purge_discarded)
+  end
+
+  def delete_services_without_procedures
+    admin.services.filter { _1.procedures.with_discarded.count.zero? }.each(&:destroy)
+  end
+
+  def transfer_services
+    shared_procedures.each do |procedure|
+      next if procedure.service.nil?
+      next_admin = procedure.administrateurs.where.not(id: admin.id).first
+      procedure.service.update(administrateur: next_admin)
+    end
+  end
+end
diff --git a/app/views/manager/administrateurs/show.html.erb b/app/views/manager/administrateurs/show.html.erb
index b0d47c512..ab68a1f80 100644
--- a/app/views/manager/administrateurs/show.html.erb
+++ b/app/views/manager/administrateurs/show.html.erb
@@ -36,7 +36,7 @@ as well as a link to its edit page.
     <% if page.resource.invitation_expired? %>
       <%= link_to "renvoyer l'invitation", reinvite_manager_administrateur_path(page.resource), method: :post, class: "button" %>
     <% end %>
-    <%= button_to "supprimer", delete_manager_administrateur_path(page.resource), method: :delete, disabled: !page.resource.can_be_deleted?, class: "button", data: { confirm: "Confirmez-vous la suppression de l'administrateur ?" }, title: page.resource.can_be_deleted? ? "Supprimer" : "Cet administrateur a des démarches dont il est le seul admin et ne peut être supprimé" %>
+    <%= button_to "supprimer", delete_manager_administrateur_path(page.resource), method: :delete, disabled: !page.resource.can_be_deleted?, class: "button", data: { turbo_confirm: "Confirmez-vous la suppression de l'administrateur ?" }, title: page.resource.can_be_deleted? ? "Supprimer" : "Cet administrateur a des démarches dont il est le seul admin et ne peut être supprimé" %>
   </div>
 
 </header>
diff --git a/app/views/manager/instructeurs/show.html.erb b/app/views/manager/instructeurs/show.html.erb
index 0a043f377..ba6af8ea7 100644
--- a/app/views/manager/instructeurs/show.html.erb
+++ b/app/views/manager/instructeurs/show.html.erb
@@ -36,7 +36,7 @@ as well as a link to its edit page.
       <%= link_to 'Réinviter', reinvite_manager_instructeur_path(instructeur), method: :post, class: 'button' %>
   </div>
   <div>
-    <%= button_to "Supprimer", delete_manager_instructeur_path(page.resource), method: :delete, disabled: !page.resource.can_be_deleted?, class: "button", data: { confirm: "Confirmez-vous la suppression de l'instructeur ?" }, title: page.resource.can_be_deleted? ? "Supprimer" : "Cet instructeur est administrateur ou a des démarches dont il est le seul instructeur et ne peut être supprimé" %>
+    <%= button_to "Supprimer", delete_manager_instructeur_path(page.resource), method: :delete, disabled: !page.resource.can_be_deleted?, class: "button", data: { turbo_confirm: "Confirmez-vous la suppression de l'instructeur ?" }, title: page.resource.can_be_deleted? ? "Supprimer" : "Cet instructeur est administrateur ou a des démarches dont il est le seul instructeur et ne peut être supprimé" %>
   </div>
 </header>
 
diff --git a/app/views/manager/users/show.html.erb b/app/views/manager/users/show.html.erb
index 03e68bc26..9a0fa57ee 100644
--- a/app/views/manager/users/show.html.erb
+++ b/app/views/manager/users/show.html.erb
@@ -29,7 +29,7 @@ as well as a link to its edit page.
     <%= button_to "modifier", edit_manager_user_path(page.resource), method: :get, class: "button" %>
   </div>
   <div>
-    <%= button_to "supprimer", delete_manager_user_path(page.resource), method: :delete, disabled: !page.resource.can_be_deleted?, class: "button", data: { confirm: "Confirmez-vous la suppression de l'utilisateur ?" }, title: page.resource.can_be_deleted? ? "Supprimer" : "Cet utilisateur ne peut être supprimé. Il a des dossiers dont l'instruction a commencé ou il est administrateur ou instructeur" %>
+    <%= button_to "supprimer", delete_manager_user_path(page.resource), method: :delete, disabled: !page.resource.can_be_deleted?, class: "button", data: { turbo_confirm: "Confirmez-vous la suppression de l'utilisateur ?" }, title: page.resource.can_be_deleted? ? "Supprimer" : "Cet utilisateur ne peut être supprimé. Il a des dossiers dont l'instruction a commencé ou il est administrateur ou instructeur" %>
   </div>
   <div>
     <% if !user.confirmed? %>
diff --git a/config/locales/views/manager/fr.yml b/config/locales/views/manager/fr.yml
index 5898e2120..378148b02 100644
--- a/config/locales/views/manager/fr.yml
+++ b/config/locales/views/manager/fr.yml
@@ -2,3 +2,13 @@ fr:
   manager:
     gestionnaires:
       manage_root_groupe_gestionnaire: Gestion du groupe racine
+    groupe_gestionnaires:
+      add_gestionnaire:
+        wrong_address:
+          one: "%{emails} n’est pas une adresse email valide"
+          other: "%{emails} ne sont pas des adresses emails valides"
+    administrateurs:
+      delete:
+        cannot_be_deleted: "L'administrateur ne peut pas être supprimé"
+        still_procedures: "L'administrateur ne peut pas être supprimé car il a encore des démarches"
+        still_services: "L'administrateur ne peut pas être supprimé car il a encore des services"
diff --git a/spec/models/administrateur_spec.rb b/spec/models/administrateur_spec.rb
index 958d9016e..7750b59a1 100644
--- a/spec/models/administrateur_spec.rb
+++ b/spec/models/administrateur_spec.rb
@@ -17,11 +17,26 @@ describe Administrateur, type: :model do
       it { is_expected.to be true }
     end
 
-    context "when the administrateur has a procedure where they is the only admin" do
+    context "when the administrateur has a procedure with dossiers where they is the only admin" do
+      let!(:administrateur) { create(:administrateur) }
+      let!(:procedure) { create(:procedure_with_dossiers, administrateurs: [administrateur]) }
+
+      it { is_expected.to be false }
+    end
+
+    context "when the administrateur has a procedure with dossiers and with other admins" do
+      let!(:administrateur) { create(:administrateur) }
+      let!(:administrateur2) { create(:administrateur) }
+      let!(:procedure) { create(:procedure_with_dossiers, administrateurs: [administrateur, administrateur2]) }
+
+      it { is_expected.to be true }
+    end
+
+    context "when the administrateur has a procedure without dossiers" do
       let!(:administrateur) { create(:administrateur) }
       let!(:procedure) { create(:procedure, administrateurs: [administrateur]) }
 
-      it { is_expected.to be false }
+      it { is_expected.to be true }
     end
 
     context "when the administrateur has no procedure" do
diff --git a/spec/services/administrateur_deletion_service_spec.rb b/spec/services/administrateur_deletion_service_spec.rb
new file mode 100644
index 000000000..2a64392cb
--- /dev/null
+++ b/spec/services/administrateur_deletion_service_spec.rb
@@ -0,0 +1,63 @@
+describe AdministrateurDeletionService do
+  let(:super_admin) { create(:super_admin) }
+  let(:admin) { create(:administrateur) }
+  let(:service) { create(:service, administrateur: admin) }
+  let(:other_admin) { create(:administrateur) }
+  let(:procedure) { create(:procedure, service: service, administrateurs: [admin, other_admin]) }
+  let(:owned_procedure_service) { create(:service, administrateur: admin) }
+  let(:owned_procedure) { create(:procedure, service: owned_procedure_service, administrateurs: [admin]) }
+
+  describe '#call' do
+    subject { AdministrateurDeletionService.new(super_admin, admin).call }
+
+    context 'when admin can be deleted' do
+      it 'removes admin procedures without dossiers' do
+        owned_procedure
+        subject
+        expect(Procedure.find_by(id: owned_procedure.id)).to be_nil
+      end
+
+      it 'removes service admins without procedure' do
+        owned_procedure
+        subject
+        expect(Service.find_by(id: owned_procedure_service.id)).to be_nil
+      end
+
+      it 'transfer services to other admin' do
+        procedure
+        subject
+        expect(procedure.service.administrateur).to eq other_admin
+      end
+
+      it 'deletes admin' do
+        procedure
+        owned_procedure
+        subject
+        expect(Administrateur.find_by(id: admin.id)).to be_nil
+      end
+    end
+
+    context 'when admin has some procedures with dossiers and only one admin' do
+      let(:owned_procedure_with_dossier) { create(:procedure_with_dossiers, service: owned_procedure_service, administrateurs: [admin]) }
+
+      it "doesn't destroy admin" do
+        owned_procedure_with_dossier
+        subject
+        expect(Administrateur.find_by(id: admin.id)).to eq admin
+        expect(subject.failure).to eq :cannot_be_deleted
+      end
+    end
+
+    context "when there is a failure" do
+      it 'rollbacks' do
+        allow_any_instance_of(Service).to receive(:update).and_return(false)
+        procedure
+        owned_procedure
+        subject
+        expect(subject.failure).to eq :still_services
+        expect(admin.procedures.count).to eq 2
+        expect(procedure.administrateurs).to include(admin)
+      end
+    end
+  end
+end