The 2003 Welsh Open (officially the 2003 Regal Welsh Open) was a professional ranking snooker tournament that took place from 22 to 26 January at the Cardiff International Arena in Cardiff, Wales.

[1] Paul Hunter was the defending champion, but he lost in the semi-finals 2–6 against Mark Williams.

Williams in turn lost to Stephen Hendry 9–5 in the final.

Defending champion Paul Hunter was the number 1 seed with World Champion Peter Ebdon seeded 2.

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