Jason Marcy is a cartoonist living in Hamilton, Ontario who works primarily in the field of autobiographical comics. His series of Jay's Days books recount his days working for a record store chain and later in a pasta shop, and delve into his relationships with his friends, co-workers, and family members.

He began his comics career with a series of mini-comics titles, beginning with Gavin, then Powerwus and Tales from the Petro-Canada Man, the latter of which began his work in autobiographical cartooning.

Inspired by the work of James Kochalka, Marcy keeps a daily cartoon diary that is linked from his website.