List of 2003 box office number-one films in Australia

This is a list of films which placed number-one at the box office in Australia during 2003. Amounts are in Australian dollars. This article transitions from weekend end date to week end date, thus accounting for the additional week (a total of 53). Also included are the positions at the box office other films opened at. Quite a number of these are films from the previous year due to normal Australian film distribution delays.