Peter J. Tomasi is an American comic book writer, best known for his work for DC Comics, such as Batman And Robin; Superman; Super Sons; Batman: Detective Comics; Green Lantern Corps; and Superman/Wonder Woman; as well as Batman: Arkham Knight; Brightest Day; Green Lantern: Emerald Warriors; Nightwing; Black Adam, and many more.

In the course of his staff career at DC Comics, Tomasi served as a group editor and ushered in new eras for Batman, Green Lantern, and the JSA, along with a host of special projects like Kingdom Come.

He is also the author of the creator-owned titles House Of Penance with artist Ian Bertram; Light Brigade with artist Peter Snejbjerg; The Mighty with Keith Champagne and Chris Samnee; and the critically acclaimed epic graphic novel The Bridge: How The Roeblings Connected Brooklyn To New York, illustrated by Sara DuVall and published by Abrams ComicArts.

In 2018 New York Times best-selling author Tomasi received the Inkpot Award for achievement in comics.