Mark Stephen Evanier is an American comic book and television writer, known for his work on the animated TV series Garfield and Friends and on the comic book Groo the Wanderer. He is also known for his columns and blog News from ME, and for his work as a historian and biographer of the comics industry, such as his award-winning Jack Kirby biography, Kirby: King of Comics.

Groo the Wanderer is a fantasy/comedy comic book character created by Sergio Aragonés. His stories are written and drawn by Aragonés, dialogued and edited by Mark Evanier, lettered by Stan Sakai and colored by Tom Luth. Over the years, Groo has been published by Pacific Comics, Eclipse Comics, Marvel Comics, Image Comics and Dark Horse Comics.