If you have created a group on facebook. But due to some reasons now your question is how do i delete a group i created on facebook. So, this is very easy to delete your facebook group. 

Open your facebook

Go to your facebook homepage

Select groups

Now choose your group which you want to delete

Select member you have to remove all your group members

Now select your name and click on leave group

After leaving the group 

Select delete group permanently 

source- https://ityug247.com/how-to-delete-a-facebook-group/