diff --git src/bp-templates/bp-nouveau/buddypress/common/js-templates/activity/form.php src/bp-templates/bp-nouveau/buddypress/common/js-templates/activity/form.php
index ef5cfbbfd..285245993 100644
--- src/bp-templates/bp-nouveau/buddypress/common/js-templates/activity/form.php
+++ src/bp-templates/bp-nouveau/buddypress/common/js-templates/activity/form.php
@@ -2,10 +2,15 @@
 /**
  * Activity Post form JS Templates
  *
- * @version 3.1.0
+ * @since 3.0.0
+ * @version 5.0.0
  */
 ?>
 
+<script type="text/html" id="tmpl-activity-before-post-form-inputs">
+	<?php bp_nouveau_activity_hook( 'before', 'post_form' ); ?>
+</script>
+
 <script type="text/html" id="tmpl-activity-post-form-feedback">
 	<span class="bp-icon" aria-hidden="true"></span><p>{{{data.message}}}</p>
 </script>
diff --git src/bp-templates/bp-nouveau/includes/activity/functions.php src/bp-templates/bp-nouveau/includes/activity/functions.php
index 385dd1634..975bc5e86 100644
--- src/bp-templates/bp-nouveau/includes/activity/functions.php
+++ src/bp-templates/bp-nouveau/includes/activity/functions.php
@@ -3,7 +3,7 @@
  * Activity functions
  *
  * @since 3.0.0
- * @version 3.1.0
+ * @version 5.0.0
  */
 
 // Exit if accessed directly.
@@ -67,7 +67,10 @@ function bp_nouveau_activity_localize_scripts( $params = array() ) {
 	$activity_params = array(
 		'user_id'     => bp_loggedin_user_id(),
 		'object'      => 'user',
-		'backcompat'  => (bool) has_action( 'bp_activity_post_form_options' ),
+		'backcompat'  => array(
+			'before_post_form'  => (bool) has_action( 'bp_before_activity_post_form' ),
+			'post_form_options' => (bool) has_action( 'bp_activity_post_form_options' ),
+		),
 		'post_nonce'  => wp_create_nonce( 'post_update', '_wpnonce_post_update' ),
 	);
 
diff --git src/bp-templates/bp-nouveau/includes/activity/template-tags.php src/bp-templates/bp-nouveau/includes/activity/template-tags.php
index 2d73c2ed8..29e4d7273 100644
--- src/bp-templates/bp-nouveau/includes/activity/template-tags.php
+++ src/bp-templates/bp-nouveau/includes/activity/template-tags.php
@@ -3,7 +3,7 @@
  * Activity Template tags
  *
  * @since 3.0.0
- * @version 3.1.0
+ * @version 5.0.0
  */
 
 // Exit if accessed directly.
@@ -67,18 +67,12 @@ function bp_nouveau_after_activity_directory_content() {
  * Enqueue needed scripts for the Activity Post Form
  *
  * @since 3.0.0
+ * @since 5.0.0 Move the `bp_before_activity_post_form` hook inside the Activity post form.
  */
 function bp_nouveau_before_activity_post_form() {
 	if ( bp_nouveau_current_user_can( 'publish_activity' ) ) {
 		wp_enqueue_script( 'bp-nouveau-activity-post-form' );
 	}
-
-	/**
-	 * Fires before the activity post form.
-	 *
-	 * @since 1.2.0
-	 */
-	do_action( 'bp_before_activity_post_form' );
 }
 
 /**
diff --git src/bp-templates/bp-nouveau/js/buddypress-activity-post-form.js src/bp-templates/bp-nouveau/js/buddypress-activity-post-form.js
index 1e17af71d..3e3c83b78 100644
--- src/bp-templates/bp-nouveau/js/buddypress-activity-post-form.js
+++ src/bp-templates/bp-nouveau/js/buddypress-activity-post-form.js
@@ -1,5 +1,6 @@
 /* global bp, BP_Nouveau, _, Backbone */
-/* @version 3.1.0 */
+/* @since 3.0.0 */
+/* @version 5.0.0 */
 window.wp = window.wp || {};
 window.bp = window.bp || {};
 
@@ -375,6 +376,11 @@ window.bp = window.bp || {};
 		template : bp.template( 'activity-post-form-options' )
 	} );
 
+	bp.Views.BeforeFormInputs = bp.View.extend( {
+		tagName  : 'div',
+		template : bp.template( 'activity-before-post-form-inputs' )
+	} );
+
 	bp.Views.FormTarget = bp.View.extend( {
 		tagName   : 'div',
 		id        : 'whats-new-post-in-box',
@@ -586,24 +592,32 @@ window.bp = window.bp || {};
 				BP_Nouveau.activity.params,
 				['user_id', 'item_id', 'object' ]
 			) );
+			this.options.backcompat = BP_Nouveau.activity.params.backcompat;
+			var staticViews = [
+				new bp.Views.FormAvatar(),
+				new bp.Views.FormContent( { activity: this.model } )
+			];
+
+			// Backcompat to take the `bp_before_activity_post_form` action in account.
+			if ( true === this.options.backcompat.before_post_form ) {
+				staticViews.unshift( new bp.Views.BeforeFormInputs() );
+			}
 
 			// Clone the model to set the resetted one
 			this.resetModel = this.model.clone();
 
-			this.views.set( [
-				new bp.Views.FormAvatar(),
-				new bp.Views.FormContent( { activity: this.model } )
-			] );
+			this.views.set( staticViews );
 
 			this.model.on( 'change:errors', this.displayFeedback, this );
 		},
 
 		displayFull: function( event ) {
+			var numStaticViews = true === this.options.backcompat.before_post_form ? 3 : 2;
 
 			// Remove feedback.
 			this.cleanFeedback();
 
-			if ( 2 !== this.views._views[''].length ) {
+			if ( numStaticViews !== this.views._views[''].length ) {
 				return;
 			}
 
@@ -612,29 +626,33 @@ window.bp = window.bp || {};
 				height : 'auto'
 			} );
 
-			// Backcompat custom fields
-			if ( true === BP_Nouveau.activity.params.backcompat ) {
+			// Add the container view for buttons or custom fields.
+			if ( true === this.options.backcompat.post_form_options ) {
 				this.views.add( new bp.Views.FormOptions( { model: this.model } ) );
+			} else {
+				this.views.add( new bp.View( { id: 'whats-new-options' } ) );
 			}
 
 			// Attach buttons
 			if ( ! _.isUndefined( BP_Nouveau.activity.params.buttons ) ) {
 				// Global
 				bp.Nouveau.Activity.postForm.buttons.set( BP_Nouveau.activity.params.buttons );
-				this.views.add( new bp.Views.FormButtons( { collection: bp.Nouveau.Activity.postForm.buttons, model: this.model } ) );
+				this.views.add( '#whats-new-options', new bp.Views.FormButtons( { collection: bp.Nouveau.Activity.postForm.buttons, model: this.model } ) );
 			}
 
 			// Select box for the object
 			if ( ! _.isUndefined( BP_Nouveau.activity.params.objects ) && 1 < _.keys( BP_Nouveau.activity.params.objects ).length ) {
-				this.views.add( new bp.Views.FormTarget( { model: this.model } ) );
+				this.views.add( '#whats-new-options', new bp.Views.FormTarget( { model: this.model } ) );
 			}
 
-			this.views.add( new bp.Views.FormSubmit( { model: this.model } ) );
+			this.views.add( '#whats-new-options', new bp.Views.FormSubmit( { model: this.model } ) );
 		},
 
 		resetForm: function() {
+			var self = this, indexStaticViews = self.options.backcompat.before_post_form ? 2 : 1;
+
 			_.each( this.views._views[''], function( view, index ) {
-				if ( index > 1 ) {
+				if ( index > indexStaticViews ) {
 					view.remove();
 				}
 			} );