Latham Gaines (born February 3, 1964) is an American actor who is best known for portraying Mesogog and Dr. Anton Mercer in Power Rangers: Dino Thunder. He and Katrina Devine have both appeared together not only on Power Rangers: Dino Thunder but also in the final season of Xena: Warrior Princess. Katrina was in the episode "Last of the Centaurs" while Latham was in the episode "Many Happy Returns". Latham is also part of a band project called Theodore High, which also features another Power Rangers: Dino Thunder actor, Tom Hern.

After marrying, he moved to New Zealand in 1995. He had made an appearance at the Power Morphicon in June of 2007. There, Gaines mentioned having moved back to the United States and living in New York City. He also played a part in Bridge To Terabithia, and made an appearance in the 2005 remake of King Kong as a reporter.

Latham is an actor and an artist who lives in New York. He is the son of novelist Charles Gaines who wrote "Pumping Iron" and "Stay Hungry". Latham lived in New Zealand for 11 years working in t.v., movies and theater before moving to New York in 2007. Latham studied acting at N.Y.U.