Sean Punch (born July 27, 1967) is a Canadian writer and game designer. He is the author of the fourth edition of the GURPS role-playing game. Before he turned to writing he was a student of particle physics.

After writing, editing, and contributing to dozens of books for GURPS, Sean Punch took over from the game's original designer Steve Jackson as the line editor for GURPS in 1995. Assisted by David L. Pulver, another Canadian and veteran role-playing game designer, he took on the task of re-designing the entire rule system for the a fourth edition of GURPS beginning in September 2002.

Sean Punch remains the Line Editor for GURPS - equivalent to being editor-in-chief of a book series, and the key decision-maker for new rules expansions.

He lives in Montreal, Quebec.

In an attempt to acknowledge the quality and quantity of his work, some GURPS players have used his online nickname ("Kromm") to create a tongue-in-cheek cult. They leave messages in discussion groups pretending to "praise Kromm."

Sean Punch has appeared in the following newspaper and magazine articles, websites, and podcasts.