Garth Ennis is a Northern Irish-American comics writer, renowned for his work on the Vertigo series Preacher with artist Steve Dillon, as well as his nine-year run on Marvel Comics' Punisher franchise, and The Boys with artist Darick Robertson.

He has collaborated with artists such as Dillon and Glenn Fabry on Preacher, John McCrea on Hitman, Marc Silvestri on The Darkness, and Carlos Ezquerra on both Preacher and Hitman. His work has earned him significant recognition in the comics industry, including nominations for the Comics Buyer's Guide Award for Favorite Writer in 1997, 1998, 1999, and 2000.

Ennis's comic-writing career began in 1989 with the series Troubled Souls, appearing in the British anthology Crisis and illustrated by McCrea. It spawned a sequel, For a Few Troubles More, and a comedy series Dicks from Caliber in 1997. Another significant work was True Faith, a religious satire inspired by his schooldays and drawn by Warren Pleece.

Like his inspiration, Alan Moore, Ennis is a promoter of left-liberal ideas, for which he has received numerous awards and recognition. His work is characterized by extreme violence, dark humor, and exploration of themes like friendship, major religions, and superheroes.