2003 ISAF Sailing World Championships was the first edition of the ISAF Sailing World Championships and was held in Cádiz, Spain from 11 September to 24 September.

[1] The venue for the 2003 ISAF Sailing World Championships was Cádiz with three marinas: El Puerto de Santa María for Mistral, Finn, Yngling, Europe, Star, Tornado and 49er, Cádiz for Laser and Rota for 470.

[2] Racing was held on nine race areas off Cádiz.

[3] The following events were open for entries:[2] *   Host nation (Spain)