MC can mean: Macau (also spelled Macao), FIPS PUB 10-4 territory code for a Chinese territory Machine or machine code (both also m/c) Magic Circle (law), term used to categorise the largest or most prestigious law firms in the United Kingdom Main character, a term used in fiction to denote a character of primary importance Manchester, England (also m/c) Marginal cost, a term in economics and finance Mariah Carey, a singer Master Chief (Halo), a character in the Halo video game series M… (More on Mc)