03 may refer to:
Common meanings The year 2003, or any year ending with 03 The month of March 3 (number)
Music 03 (album), by Urban Zakapa, 2013 03, a 2007 album by Twelve
Telephone codes 03 numbers, a non-geographic telephone number range in the UK The telephone area code for the South Island of New Zealand
Other uses Allier, a French department U.S. Marine Corps Infantry (occupational field designator 03) Tokyo Metro 03 series iCar 03, an electric compact crossover SUV Lynk & Co 03, a compact executive sedan
See also O3 (disambiguation) 3 (disambiguation)