Thomas B. Kin Chong is a Canadian-American comedian, actor, musician and activist. He is known for his role/inspiration in the marijuana industry, his marijuana-themed Cheech & Chong comedy albums and movies with Cheech Marin, and playing the character Leo on Fox's That '70s Show. He became a naturalized United States citizen in the late 1980s.

Cheech & Chong are a comedy duo founded in Vancouver and consisting of American Cheech Marin and Canadian Tommy Chong. The duo found commercial and cultural success in the 1970s and 1980s with their stand-up routines, studio recordings, and feature films, which were based on the hippie and free love era, and especially the drug and counterculture movements, most notably their love for cannabis.