2004 World Championships may refer to:
- Alpine skiing: Alpine World Ski Championships 2004
- Aquatics: 2004 World Aquatics Championships
- Athletics: 2004 World Championships in Athletics
- Cross-country running: 2004 IAAF World Cross Country Championships
- Road running: 2004 IAAF World Road Running Championships
- Badminton: 2004 BWF World Championships
- Bandy: Bandy World Championship 2004
- Biathlon: Biathlon World Championships 2004
- Boxing: 2004 World Amateur Boxing Championships
- Chess: FIDE World Chess Championship 2004
- Curling:
- Darts: 2004 BDO World Darts Championship
- Darts: 2004 PDC World Darts Championship
- Figure skating: 2004 World Figure Skating Championships
- Ice hockey: 2004 Men's World Ice Hockey Championships
- Ice hockey: 2004 Women's World Ice Hockey Championships
- Netball: 2004 Netball World Championships
- Nordic skiing: FIS Nordic World Ski Championships 2004
- Speed skating:
- Allround: 2004 World Allround Speed Skating Championships
- Sprint: 2004 World Sprint Speed Skating Championships
- Single distances: 2004 World Single Distance Speed Skating Championships