Class 1

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