2003 World Championships
- 2003 BDO World Darts Championship
- 2003 Bandy World Championship
- 2003 Continental Championships (disambiguation)
- 2003 Ford World Men's Curling Championship
- 2003 Ford World Women's Curling Championship
- 2003 IAAF World Cross Country Championships
- 2003 IAAF World Half Marathon Championships
- 2003 IBF World Championships
- 2003 Men's World Ice Hockey Championships
- 2003 Netball World Championships
- 2003 PDC World Darts Championship
- 2003 Women's World Ice Hockey Championships
- 2003 World Allround Speed Skating Championships
- 2003 World Amateur Boxing Championships
- 2003 World Aquatics Championships
- 2003 World Artistic Gymnastics Championships
- 2003 World Championships in Athletics
- 2003 World Cup (disambiguation)
- 2003 World Figure Skating Championships
- 2003 World Junior Championships (disambiguation)
- 2003 World Single Distance Speed Skating Championships
- 2003 World Sprint Speed Skating Championships
- Alpine World Ski Championships 2003
- Biathlon World Championships 2003
- FIS Nordic World Ski Championships 2003