Class 1 may refer to:
Class I railroad, a term used in North American railroad size classification Class 1 Touring Cars, an FIA classification for cars in motor racing Class 1 World Powerboat Championship Classes of United States senators SCORE Class 1, unlimited off-road racing buggies The first class in terms of hiking difficulty in the Yosemite Decimal System A contribution class in the National Insurance system in the UK An IEC protection class in the electrical appliance manufacturing industry A class in laser safety HAZMAT Class 1 Explosives
See also Class I (disambiguation) Class 01 (disambiguation) First class (disambiguation) NSB El 1, an electric locomotive of Norway NSB Di 1, a diesel locomotive of Norway Type 1 (disambiguation)