diff --git a/app/graphql/api/v2/stored_query.rb b/app/graphql/api/v2/stored_query.rb
index e2b5c78c0..1c48a5bd1 100644
--- a/app/graphql/api/v2/stored_query.rb
+++ b/app/graphql/api/v2/stored_query.rb
@@ -819,6 +819,19 @@ class API::V2::StoredQuery
     }
   }
 
+  mutation dossierSupprimerMessage($input: DossierSupprimerMessageInput!) {
+    dossierSupprimerMessage(input: $input) {
+      message {
+        id
+        createdAt
+        discardedAt
+      }
+      errors {
+        message
+      }
+    }
+  }
+
   mutation dossierModifierAnnotationText(
     $input: DossierModifierAnnotationTextInput!
   ) {
diff --git a/app/graphql/mutations/dossier_passer_en_instruction.rb b/app/graphql/mutations/dossier_passer_en_instruction.rb
index 1ece00ede..d9886b724 100644
--- a/app/graphql/mutations/dossier_passer_en_instruction.rb
+++ b/app/graphql/mutations/dossier_passer_en_instruction.rb
@@ -21,6 +21,9 @@ module Mutations
       if !dossier.en_construction?
         return false, { errors: ["Le dossier est déjà #{dossier_display_state(dossier, lower: true)}"] }
       end
+      if dossier.blocked_with_pending_correction?
+        return false, { errors: ["Le dossier est en attente de correction"] }
+      end
       dossier_authorized_for?(dossier, instructeur)
     end
   end
diff --git a/app/graphql/mutations/dossier_supprimer_message.rb b/app/graphql/mutations/dossier_supprimer_message.rb
new file mode 100644
index 000000000..bde6de51f
--- /dev/null
+++ b/app/graphql/mutations/dossier_supprimer_message.rb
@@ -0,0 +1,24 @@
+module Mutations
+  class DossierSupprimerMessage < Mutations::BaseMutation
+    description "Supprimer un message."
+
+    argument :message_id, ID, required: true, loads: Types::MessageType
+    argument :instructeur_id, ID, required: true, loads: Types::ProfileType
+
+    field :message, Types::MessageType, null: true
+    field :errors, [Types::ValidationErrorType], null: true
+
+    def resolve(message:, **args)
+      message.soft_delete!
+
+      { message: }
+    end
+
+    def authorized?(message:, instructeur:, **args)
+      if !message.soft_deletable?(instructeur)
+        return false, { errors: ["Le message ne peut pas être supprimé"] }
+      end
+      dossier_authorized_for?(message.dossier, instructeur)
+    end
+  end
+end
diff --git a/app/graphql/schema.graphql b/app/graphql/schema.graphql
index 52d58d1ad..c422408fe 100644
--- a/app/graphql/schema.graphql
+++ b/app/graphql/schema.graphql
@@ -2192,6 +2192,30 @@ enum DossierState {
   sans_suite
 }
 
+"""
+Autogenerated input type of DossierSupprimerMessage
+"""
+input DossierSupprimerMessageInput {
+  """
+  A unique identifier for the client performing the mutation.
+  """
+  clientMutationId: String
+  instructeurId: ID!
+  messageId: ID!
+}
+
+"""
+Autogenerated return type of DossierSupprimerMessage.
+"""
+type DossierSupprimerMessagePayload {
+  """
+  A unique identifier for the client performing the mutation.
+  """
+  clientMutationId: String
+  errors: [ValidationError!]
+  message: Message
+}
+
 type DropDownListChampDescriptor implements ChampDescriptor {
   """
   Description des champs d’un bloc répétable.
@@ -3084,6 +3108,7 @@ type Message {
   body: String!
   correction: Correction
   createdAt: ISO8601DateTime!
+  discardedAt: ISO8601DateTime
   email: String!
   id: ID!
 }
@@ -3313,6 +3338,16 @@ type Mutation {
     input: DossierRepasserEnInstructionInput!
   ): DossierRepasserEnInstructionPayload
 
+  """
+  Supprimer un message.
+  """
+  dossierSupprimerMessage(
+    """
+    Parameters for DossierSupprimerMessage
+    """
+    input: DossierSupprimerMessageInput!
+  ): DossierSupprimerMessagePayload
+
   """
   Ajouter des instructeurs à un groupe instructeur.
   """
diff --git a/app/graphql/types/message_type.rb b/app/graphql/types/message_type.rb
index 70622647b..788075bb2 100644
--- a/app/graphql/types/message_type.rb
+++ b/app/graphql/types/message_type.rb
@@ -4,6 +4,7 @@ module Types
     field :email, String, null: false
     field :body, String, null: false
     field :created_at, GraphQL::Types::ISO8601DateTime, null: false
+    field :discarded_at, GraphQL::Types::ISO8601DateTime, null: true
     field :attachment, Types::File, null: true, deprecation_reason: "Utilisez le champ `attachments` à la place.", extensions: [
       { Extensions::Attachment => { attachments: :piece_jointe, as: :single } }
     ]
@@ -19,5 +20,9 @@ module Types
     def correction
       Loaders::Association.for(object.class, :dossier_correction).load(object)
     end
+
+    def self.authorized?(object, context)
+      context.authorized_demarche?(object.dossier.revision.procedure)
+    end
   end
 end
diff --git a/app/graphql/types/mutation_type.rb b/app/graphql/types/mutation_type.rb
index ce2f8ac56..b9ad5a92c 100644
--- a/app/graphql/types/mutation_type.rb
+++ b/app/graphql/types/mutation_type.rb
@@ -3,6 +3,7 @@ module Types
     field :create_direct_upload, mutation: Mutations::CreateDirectUpload
 
     field :dossier_envoyer_message, mutation: Mutations::DossierEnvoyerMessage
+    field :dossier_supprimer_message, mutation: Mutations::DossierSupprimerMessage
     field :dossier_passer_en_instruction, mutation: Mutations::DossierPasserEnInstruction
     field :dossier_classer_sans_suite, mutation: Mutations::DossierClasserSansSuite
     field :dossier_refuser, mutation: Mutations::DossierRefuser
diff --git a/app/models/dossier.rb b/app/models/dossier.rb
index 123c7768c..54c187169 100644
--- a/app/models/dossier.rb
+++ b/app/models/dossier.rb
@@ -558,8 +558,12 @@ class Dossier < ApplicationRecord
     false
   end
 
+  def blocked_with_pending_correction?
+    procedure.feature_enabled?(:blocking_pending_correction) && pending_correction?
+  end
+
   def can_passer_en_instruction?
-    return false if procedure.feature_enabled?(:blocking_pending_correction) && pending_correction?
+    return false if blocked_with_pending_correction?
 
     true
   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 6fa77c40b..a42d90210 100644
--- a/spec/controllers/api/v2/graphql_controller_stored_queries_spec.rb
+++ b/spec/controllers/api/v2/graphql_controller_stored_queries_spec.rb
@@ -912,6 +912,17 @@ describe API::V2::GraphqlController do
           expect(ActionMailer::Base.deliveries.size).to eq(0)
         }
       end
+
+      context 'with pending corrections' do
+        before { Flipper.enable(:blocking_pending_correction, dossier.procedure) }
+        let!(:dossier_correction) { create(:dossier_correction, dossier:) }
+
+        it {
+          expect(dossier.pending_correction?).to be_truthy
+          expect(gql_errors).to be_nil
+          expect(gql_data[:dossierPasserEnInstruction][:errors]).to eq([{ message: "Le dossier est en attente de correction" }])
+        }
+      end
     end
 
     context 'dossierRepasserEnConstruction' do
@@ -1332,5 +1343,77 @@ describe API::V2::GraphqlController do
         }
       end
     end
+
+    context 'dossierEnvoyerMessage' do
+      let(:dossier) { create(:dossier, :en_construction, :with_individual, procedure:) }
+      let(:variables) { { input: { dossierId: dossier.to_typed_id, instructeurId: instructeur.to_typed_id, body: 'Hello World!' } } }
+      let(:operation_name) { 'dossierEnvoyerMessage' }
+
+      it {
+        expect(gql_errors).to be_nil
+        expect(gql_data[:dossierEnvoyerMessage][:errors]).to be_nil
+        expect(gql_data[:dossierEnvoyerMessage][:message][:id]).to eq(dossier.commentaires.first.to_typed_id)
+        perform_enqueued_jobs
+        expect(ActionMailer::Base.deliveries.size).to eq(1)
+      }
+    end
+
+    context 'dossierSupprimerMessage' do
+      let(:dossier) { create(:dossier, :en_construction, :with_individual, procedure:) }
+      let(:message) { create(:commentaire, dossier:, instructeur:) }
+      let(:dossier_correction) { create(:dossier_correction, dossier:, commentaire: message) }
+      let(:variables) { { input: { messageId: message.to_typed_id, instructeurId: instructeur.to_typed_id } } }
+      let(:operation_name) { 'dossierSupprimerMessage' }
+
+      it {
+        expect(message.discarded?).to be_falsey
+        expect(gql_errors).to be_nil
+        expect(gql_data[:dossierSupprimerMessage][:errors]).to be_nil
+        expect(gql_data[:dossierSupprimerMessage][:message][:id]).to eq(message.to_typed_id)
+        expect(gql_data[:dossierSupprimerMessage][:message][:discardedAt]).not_to be_nil
+        expect(message.reload.discarded?).to be_truthy
+      }
+
+      it {
+        expect(dossier_correction.commentaire.discarded?).to be_falsey
+        expect(dossier.pending_correction?).to be_truthy
+        expect(gql_errors).to be_nil
+        expect(gql_data[:dossierSupprimerMessage][:errors]).to be_nil
+        expect(gql_data[:dossierSupprimerMessage][:message][:id]).to eq(message.to_typed_id)
+        expect(gql_data[:dossierSupprimerMessage][:message][:discardedAt]).not_to be_nil
+        expect(message.reload.discarded?).to be_truthy
+        expect(dossier.pending_correction?).to be_falsey
+      }
+
+      context 'when unauthorized' do
+        let(:dossier) { create(:dossier, :en_construction, :with_individual) }
+
+        it {
+          expect(message.discarded?).to be_falsey
+          expect(gql_errors.first[:message]).to eq("An object of type Message was hidden due to permissions")
+        }
+      end
+
+      context 'when from not the same instructeur' do
+        let(:other_instructeur) { create(:instructeur, followed_dossiers: dossiers) }
+        let(:variables) { { input: { messageId: message.to_typed_id, instructeurId: other_instructeur.to_typed_id } } }
+
+        it {
+          expect(message.discarded?).to be_falsey
+          expect(gql_errors).to be_nil
+          expect(gql_data[:dossierSupprimerMessage][:errors]).to eq([{ message: "Le message ne peut pas être supprimé" }])
+        }
+      end
+
+      context 'when from usager' do
+        let(:message) { create(:commentaire, dossier:) }
+
+        it {
+          expect(message.discarded?).to be_falsey
+          expect(gql_errors).to be_nil
+          expect(gql_data[:dossierSupprimerMessage][:errors]).to eq([{ message: "Le message ne peut pas être supprimé" }])
+        }
+      end
+    end
   end
 end