Greg Townley is a professional stunt performer and champion tumbler from Great Britain. He is known for playing Number Three in the film adaptation of I Am Number Four.

Not much is known about his personal life other than he was born and raised in Derbyshire, England and is a  tumbling champion that represents Great Britain.

Townley was the stunt double for Chloe Grace Moretz in Kick-Ass and also played the part of Greg in "The World's End, the third in the Cornetto Trilogy, in which he performed his own stunts.