Gregory "Greg" Heffley is an American middle school student and the main protagonist of the Diary Of A Wimpy Kid series. He is believed to be loosely based on Jeff Kinney when he was in middle school. Greg is very concerned about his popularity level and how he looks in public. He absolutely loves video games and slacking off, taking after his older brother Rodrick. He takes up a lot of traits from Rodrick (such as selfishness, laziness, etc.). He also has an interest in cartooning and making comics. He was played by Zachary Gordon in the live-action movies Diary Of A Wimpy Kid, Diary Of A Wimpy Kid: Rodrick Rules, and Diary Of A Wimpy Kid: Dog Days, even though the books are whiteboard animated. Greg is portrayed by Jason Drucker in the live-action film, Diary Of A Wimpy Kid: The Long Haul .


Greg Heffley first appeared in the Macy's Thanksgiving Day Parade in 2010, and been in the parade ever since. The original balloon retired after 2015 and was replaced by a new version in 2016 that features Greg in color wearing his winter clothes and is in an upside-down pose.