Metro is:
- an urban underground rail mass transit system (also called subway or underground): see metro;
- specifically, the Bucharest metro (Metrou)
- specifically, the Metropolitan Transit Authority of Harris County, Texas of Houston (Capitalized as METRO)
- specifically, the Paris Métro, its full name being Métropolitain;
- specifically, the Montreal Metro
- specifically, the Washington Metro underground rail mass transit system;
- short for metropolitan area (as in Metro Manila or Washington, DC Metro Area);
- Germany's largest retail corporation (comperable to Walmart in the US): see Metro AG;
- a make of car produced by Rover in Europe;
- a make of car produced by Chevrolet in the United States: see Geo Metro;
- one of two possible free newspapers -- see: