Mark Dunn is an American author and playwright, born on July 12, 1956, in Memphis, Tennessee. He studied film at Memphis State University (now the University of Memphis) and pursued post-graduate work in screenwriting at the University of Texas at Austin.

In 1987, Dunn moved to New York where he worked at the New York Public Library while writing plays in his free time. Among the 35 plays Dunn has written (as of 2023), Belles and Five Tellers Dancing in the Rain have been produced over 150 times. He served as playwright-in-residence with the New Jersey Repertory Company and the Community Theatre League in Williamsport, Pennsylvania.

Dunn is the author of the popular "progressively lipogrammatic" novel Ella Minnow Pea (2001). In 1998, Dunn sued the writers, distributors, and producers of The Truman Show, claiming that the story was based on a play he had written and performed Off-Broadway in 1992, Frank's Life.