The 2004 Welsh Open was a professional ranking snooker tournament that took place between 15 and 25 January at the Welsh Institute of Sport in Cardiff, Wales.

Stephen Hendry was the defending champion, but he lost in the quarter-finals 4–5 against Marco Fu.

Ronnie O'Sullivan recovered from 5–8 down to defeat Steve Davis 9–8 in the final.

The remaining places were allocated to players based on the world rankings.

[2][3] Qualifying for the tournament took place at Pontins in Prestatyn, Wales between 9 and 13 December 2003.