Gary the Rat is an American adult animated sitcom created by the Cullen Brothers for Spike TV (previously known as TNN) and animated by Spike Animation Studios. It was produced by Grammnet Productions and Cheyenne Enterprises and distributed by Viacom.

It began as web episodes in flash animation on the internet in 2000, created by the defunct eStudio (later re-structured studio BLITZ) for Mediatrip.com. It consisted of 13 short episodes programmed in Adobe Flash which also included a game to occupy the viewer while the episode loaded in the background.

The network TV series aired on Spike in 2003, lasting for two seasons.