diff --git a/addons/mail/models/mail_activity.py b/addons/mail/models/mail_activity.py
index 79601fe3b19..01f4e78cb2a 100644
--- a/addons/mail/models/mail_activity.py
+++ b/addons/mail/models/mail_activity.py
@@ -568,6 +568,17 @@ class MailActivity(models.Model):
     def action_close_dialog(self):
         return {'type': 'ir.actions.act_window_close'}
 
+    def action_open_document(self):
+        """ Opens the related record based on the model and ID """
+        self.ensure_one()
+        return {
+            'res_id': self.res_id,
+            'res_model': self.res_model,
+            'target': 'current',
+            'type': 'ir.actions.act_window',
+            'view_mode': 'form',
+        }
+
     def activity_format(self):
         activities = self.read()
         mail_template_ids = set([template_id for activity in activities for template_id in activity["mail_template_ids"]])
diff --git a/addons/mail/views/mail_activity_views.xml b/addons/mail/views/mail_activity_views.xml
index 460b9782989..6ed716a45d5 100644
--- a/addons/mail/views/mail_activity_views.xml
+++ b/addons/mail/views/mail_activity_views.xml
@@ -99,6 +99,11 @@
         <field name="arch" type="xml">
             <form string="Log an Activity" create="false">
                 <sheet string="Activity">
+                    <div class="oe_button_box" name="button_box">
+                        <button name="action_open_document" string="Open Document"
+                                type="object" class="oe_link" icon="fa-file-text-o"
+                                attrs="{'invisible': ['|', ('res_model', '=', False), ('res_id', '=', 0)]}"/>
+                    </div>
                     <group invisible="1">
                         <field name="activity_category" invisible="1" />
                         <field name="res_model" invisible="1"/>