Renfield T. Rodent is a character that appears in the Sonic the Hedgehog comic series and its spin-offs published by Archie Comics. He is a smiling, sharp-dressed rat character with brown fur and reddish-brown eyes who was in charge of several criminal organizations and shady dealings, most often occurring in his personal amusement park known as "Happy Land", located on Angel Island. Renfield was first introduced in the Chaotix comic book special, he invited Sonic, Knuckles and the fellow Freedom Fighters to be his "guests" at his amusement park.
Renfield then trapped Sonic and the Freedom Fighters in a House of Mirrors (within the mirrors themselves). Knuckles managed to escape and later met up with the rest of the Chaotix, including Heavy and Bomb. Turns out that Dr. Robotnik had made a deal with Renfield and worked together with him to trap the Freedom Fighters. Knuckles and the Chaotix liberated Sonic and the others, and making short work of Robotnik's new Metal Sonic robot. Robotnik ditched Renfield and allowed him to be captured by Knuckles. Later on, Renfield reopened his amusement park to the public.
The Chaotix once again ran into Renfield when Charmy Bee's best friend, Mello, died of food poisoning from Renfield's "secret sauce" that he put in the park's chili dogs. Downtown Ebony Hare found out about Renfield's plans and forced his way into controlling Renfield's business just as the Chaotix and Knuckles had entered the amusement park. Ebony Hare was arrested but Renfield was allowed to operate his amusement park, but without the toxic secret sauce, confiscated by Sergeant Remington. Renfield was not seen until much later in "The Chaotix Connection" (Sonic issue 166). Rouge the Bat accompanied Knuckles and the Chaotix to Renfield's newly-opened Casinopolis in Station Square. It was revealed that Renfield was using the casino as a front for Robotnik's newest Auto-Automaton factory, which used scanners hidden in the slot machine screens to copy customers data and build up an army of infiltrators.
- Renfield was referred to in the comics as Renfield T. Rodent, the T standing for "the."