diff --git a/frontend/cypress/integration/actions_spec.ts b/frontend/cypress/integration/actions_spec.ts
index 337f896d..7fde4a53 100644
--- a/frontend/cypress/integration/actions_spec.ts
+++ b/frontend/cypress/integration/actions_spec.ts
@@ -313,6 +313,25 @@ describe('Actions management', () => {
             }, fusionProject1.id)
         })
 
+        it(`Complete action by ${roleThatCanComplete} on ${randomProgression}
+            then verify that completed action is not editable`, () => {
+            let user = seed.findParticipantByRole(roleThatCanComplete).user
+            cy.visitProgression(randomProgression, seed.evaluationId, user, fusionProject1.id)
+            ;({ actionNotes, action } = findActionWithNotes(seed))
+            ;({ updatedAction, newNote } = createCompleteAction(user, action))
+
+            actionsGrid.actionLink(action.questionOrder, action.title).click()
+
+            editActionDialog.assertCompletedInView(action.completed)
+
+            editActionDialog.completeActionButton().click()
+            editActionDialog.assertCompleteConfirmViewVisible(true)
+            editActionDialog.completedReasonInput().replace(newNote.text)
+            editActionDialog.completeActionConfirmButton().click()
+
+            editActionDialog.assertEditActionDisabled(seed)
+        })
+
         it(`Cancel complete action by ${roleThatCanComplete} on ${randomProgression}
             then verify action was not completed`, () => {
             cy.visitProgression(
diff --git a/frontend/cypress/page_objects/action.ts b/frontend/cypress/page_objects/action.ts
index f172f2f2..778417ca 100644
--- a/frontend/cypress/page_objects/action.ts
+++ b/frontend/cypress/page_objects/action.ts
@@ -3,6 +3,7 @@ import { Action, Note } from '../support/testsetup/mocks'
 import { FUSION_DATE_LOCALE } from '../support/helpers/helpers'
 import { Priority } from '../../src/api/models'
 import { SavingState } from '../../src/utils/Variables'
+import { EvaluationSeed } from '../support/testsetup/evaluation_seed'
 
 /**
  * List of actions under every question
@@ -200,6 +201,24 @@ export class EditActionDialog extends ActionDialog {
         this.completeActionConfirmButton().should(completeViewOpen ? 'be.visible' : 'not.exist')
         this.completeActionCancelButton().should(completeViewOpen ? 'be.visible' : 'not.exist')
     }
+
+    /**
+     * Check that an action is not editable
+     * @param seed
+     */
+    assertEditActionDisabled = (seed: EvaluationSeed) => {
+        this.titleInput().should('be.disabled')
+        this.assignedToInput().click()
+        const participantList = seed.participants.map(p => { return p.user.name })
+        participantList.forEach(participantName => {
+            cy.get('section').contains(participantName).should('be.disabled')
+        })
+        this.dueDateInput().should('be.disabled')
+        this.priorityInput().children().eq(0).children().eq(0).should('have.class', 'fc--Select__disabled--TZzty')
+        this.descriptionInput().should('be.disabled')
+        this.notesInput().should('be.disabled')
+        this.addNoteButton().should('be.disabled')
+    }
 }
 
 /**
diff --git a/frontend/src/components/Action/EditForm/ActionEditSidebar.tsx b/frontend/src/components/Action/EditForm/ActionEditSidebar.tsx
index 600b25e9..e24d7cbe 100644
--- a/frontend/src/components/Action/EditForm/ActionEditSidebar.tsx
+++ b/frontend/src/components/Action/EditForm/ActionEditSidebar.tsx
@@ -137,7 +137,7 @@ const ActionEditSidebar = ({
                         isClosingRemarkSaved={isClosingRemarkSaved}
                         apiErrorClosingRemark={apiErrorClosingRemark}
                         apiErrorAction={apiErrorAction}
-                        disableEditAction={disableActionEdit(isEditingFromDashboard, participant, action.isVoided)}
+                        disableEditAction={disableActionEdit(isEditingFromDashboard, participant, action)}
                     />
                     {apiErrorAction && (
                         <div style={{ marginTop: 20 }}>
@@ -153,7 +153,7 @@ const ActionEditSidebar = ({
                         text={note}
                         onChange={onChangeNote}
                         onCreateClick={onCreateNote}
-                        disabled={isNoteSaving || disableActionEdit(isEditingFromDashboard, participant, action.isVoided)}
+                        disabled={isNoteSaving || disableActionEdit(isEditingFromDashboard, participant, action)}
                     />
                     <NotesAndClosingRemarksList notesAndClosingRemarks={notesAndClosingRemarks} participantsDetails={personDetailsList} />
                 </div>
diff --git a/frontend/src/utils/disableComponents.ts b/frontend/src/utils/disableComponents.ts
index 6c138da9..34387311 100644
--- a/frontend/src/utils/disableComponents.ts
+++ b/frontend/src/utils/disableComponents.ts
@@ -8,8 +8,8 @@ import {
     participantCanProgressEvaluation,
 } from './RoleBasedAccess'
 
-export const disableActionEdit = (isEditingFromDashboard: boolean, participant: Participant | undefined, isVoided: boolean) => {
-    if (isVoided) {
+export const disableActionEdit = (isEditingFromDashboard: boolean, participant: Participant | undefined, action: Action) => {
+    if (action.isVoided || action.completed) {
         return true
     }
     if (isEditingFromDashboard) {