diff --git a/machina/apps/forum_conversation/abstract_models.py b/machina/apps/forum_conversation/abstract_models.py
index 023033b04..487289f79 100644
--- a/machina/apps/forum_conversation/abstract_models.py
+++ b/machina/apps/forum_conversation/abstract_models.py
@@ -229,7 +229,9 @@ class AbstractPost(DatedModel):
     anonymous_key = models.CharField(
         max_length=100, blank=True, null=True, verbose_name=_('Anonymous user forum key'),
     )
-
+    parent = models.ForeignKey(
+        'self', related_name='children', blank=True, null=True, on_delete=models.SET_NULL, verbose_name='Reply to post',
+    )
     # Each post can have its own subject. The subject of the thread corresponds to the
     # one associated with the first post
     subject = models.CharField(verbose_name=_('Subject'), max_length=255)
diff --git a/machina/apps/forum_conversation/forms.py b/machina/apps/forum_conversation/forms.py
index 36e266d0a..a2db99077 100644
--- a/machina/apps/forum_conversation/forms.py
+++ b/machina/apps/forum_conversation/forms.py
@@ -32,12 +32,13 @@ class PostForm(forms.ModelForm):
 
     class Meta:
         model = Post
-        fields = ['subject', 'content', 'username', 'update_reason', 'enable_signature', ]
+        fields = ['subject', 'content', 'username', 'update_reason', 'enable_signature', 'parent']
 
     def __init__(self, *args, **kwargs):
         self.user = kwargs.pop('user', None)
         self.forum = kwargs.pop('forum', None)
         self.topic = kwargs.pop('topic', None)
+        self.parent = kwargs.pop('parent', None)
 
         self.perm_handler = PermissionHandler()
 
@@ -47,6 +48,7 @@ def __init__(self, *args, **kwargs):
         self.fields['subject'].widget.attrs['placeholder'] = _('Enter your subject')
         self.fields['content'].label = _('Message')
         self.fields['content'].widget.attrs['placeholder'] = _('Enter your message')
+        self.fields['parent'].initial = self.parent
 
         # Handles anonymous users
         if self.user and self.user.is_anonymous:
@@ -99,6 +101,7 @@ def save(self, commit=True):
                 subject=self.cleaned_data['subject'],
                 approved=self.perm_handler.can_post_without_approval(self.forum, self.user),
                 content=self.cleaned_data['content'],
+                parent=self.cleaned_data['parent'],
                 enable_signature=self.cleaned_data['enable_signature'])
             if not self.user.is_anonymous:
                 post.poster = self.user
diff --git a/machina/apps/forum_conversation/migrations/0014_add_parent.py b/machina/apps/forum_conversation/migrations/0014_add_parent.py
new file mode 100644
index 000000000..df1d2b438
--- /dev/null
+++ b/machina/apps/forum_conversation/migrations/0014_add_parent.py
@@ -0,0 +1,19 @@
+# Generated by Django 3.2.11 on 2022-04-23 15:13
+
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('forum_conversation', '0013_auto_20201220_1745'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='post',
+            name='parent',
+            field=models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.SET_NULL, related_name='children', to='forum_conversatin.Post', verbose_name='Parent post'),
+        ),
+    ]
diff --git a/machina/apps/forum_conversation/views.py b/machina/apps/forum_conversation/views.py
index 4d44f0227..9de8badfb 100644
--- a/machina/apps/forum_conversation/views.py
+++ b/machina/apps/forum_conversation/views.py
@@ -212,6 +212,7 @@ def get_post_form_kwargs(self):
             'user': self.request.user,
             'forum': self.get_forum(),
             'topic': self.get_topic(),
+            'parent': self.get_parent_post(),
         }
 
         post = self.get_post()
@@ -311,6 +312,15 @@ def get_topic(self):
             self._topic = get_object_or_404(Topic, pk=pk)
         return self._topic
 
+    def get_parent_post(self):
+        if 'parent' in self.request.GET:
+            try:
+                return Post.objects.get(
+                    pk=self.request.GET['parent'])
+            except Post.DoesNotExist:
+                return None
+        return None
+
     def get_post(self):
         """ Returns the considered post if applicable. """
         pk = self.kwargs.get(self.post_pk_url_kwarg, None)
diff --git a/machina/templates/machina/forum_conversation/partials/post_form.html b/machina/templates/machina/forum_conversation/partials/post_form.html
index ba51faa0e..47602dfe1 100644
--- a/machina/templates/machina/forum_conversation/partials/post_form.html
+++ b/machina/templates/machina/forum_conversation/partials/post_form.html
@@ -12,6 +12,7 @@
 {% if post_form.username %}
     {% include "partials/form_field.html" with field=post_form.username %}
 {% endif %}
+{{ post_form.parent.as_hidden }}
 {% if post_form.update_reason %}
     {% include "partials/form_field.html" with field=post_form.update_reason %}
 {% endif %}