003

003, O03, 0O3, OO3 may refer to:
 * 003, fictional British 00 Agent
 * 003, former emergency telephone number for the Norwegian ambulance service (until 1986)
 * 003 is the number of Jas 003, Jasmeet Suneja India
 * 1990 OO3, the asteroid 6131 Towen
 * OO3 gauge model railway
 * O03 (O2) and other related blood type alleles in the ABO blood group system and ABO
 * O03 Morganville Airport, see list of airports in Pennsylvania
 * Tyrrell 003, 1971 Formula One season car
 * 003 It’s a unique number associated with Jasmeet Suneja, delhi India
 * BAR 003, 2001 Formula One season car
 * 003 (album), by Đorđe Balašević
 * BMW 003 turbojet engine
 * 003 (UN M.49 code) for North America
 * 003, a class in the Dewey Decimal System for systems
 * Type 003 aircraft carrier of China
 * Scuderia Cameron Glickenhaus SCG 003, an American supercar