John Michael McDonagh is a screenwriter and film director with Irish and British nationality. He wrote and directed The Guard (2011) and Calvary (2014), both films starring Brendan Gleeson, receiving a BAFTA Award nomination for the former. He was born in London in 1967. He is the older brother of playwright and filmmaker Martin McDonagh.

The Guard is a 2011 Irish buddy cop comedy film written and directed by John Michael McDonagh, starring Brendan Gleeson, Don Cheadle, Mark Strong and Liam Cunningham.