| Tournament Name: | LG Cup |
| Venue: | Guild Hall |
| Location: | Preston |
| Country: | England |
| Organisation: | WPBSA |
| Format: | Ranking event |
| Total Prize Fund: | £597,200 |
| Winners Share: | £82,500 |
| Highest Break: | (147) |
| Score: | 9–5 |
| Previous: | 2002 |
| Next: | 2004 |
The 2003 LG Cup was a professional ranking snooker tournament that took place between 4 and 12 October 2003 at the Guild Hall in Preston, England.
Mark Williams won the 15th ranking title of his career by defeating John Higgins 9–5 in the final. In the 11th frame of the final, Higgins made his 3rd maximum in professional competition.[1]
Chris Small came into the tournament as defending champion, however he lost 5–3 to John Parrott in the quarter-finals.
Defending champion Chris Small was the number 1 seed with World Champion Mark Williams seeded 2. The remaining places were allocated to players based on the world rankings.
The breakdown of prize money for this year is shown below:[2]
| Final: Best of 17 frames. Referee: Lawrie Annandale. Guild Hall, Preston, England, 12 October 2003. | |||
| John Higgins (5) | 5–9 | Mark Williams (2) | |
| Afternoon: 23–74 (74),,,,,,, Evening: 39–53, 91–8 (91),,,, | |||
| 147 | Highest break | 127 | |
| 2 | Century breaks | 1 | |
| 4 | 50+ breaks | 6 | |
Qualifying for the tournament took place between 4 and 18 September 2003 at Pontin's in Prestatyn, Wales.[4]
| Paul Wykes | 5–4 | Mehmet Husnu | |
| 2–5 | Luke Simmonds | ||
| 4–5 | Darryn Walker | ||
| Terry Murphy | w/o–w/d |  Liu Song | |
| w/d–w/o | Supoj Saenla | ||
| Lee Walker | 5–4 | Steve Mifsud | |
| 2–5 | Ding Junhui | ||
| Paul Davies | 5–0 | Gary Thomson | |
| Craig Butler | 5–4 | Chris Melling | |
| 0–5 | Stephen Croft | ||
| 4–5 | Scott MacKenzie | ||
| Kwan Poomjang | 5–3 | Alain Robidoux | |
| Peter Lines | 5–2 | Steven Bennie | |
| Rory McLeod | 5–2 | Carlo Giagnacovo | |
| Johl Younger | 5–2 | Michael Wild | |
| Ricky Walden | 5–3 | Phil Williams |
| 1–5 | Michael Rhodes | ||
| Andrew Norman | 5–1 | Ian Preece | |
| Simon Bedford | 5–1 | Joe Meara | |
| Jason Prince | 5–4 | ||
| Bradley Jones | 5–4 | ||
| 4–5 | Ian Brumby | ||
| 0–5 | Kurt Maflin | ||
| 3–5 | Martin Gould | ||
| Billy Snaddon | 5–4 | Stuart Mann | |
| Luke Fisher | 5–3 | Joe Delaney | |
| Ryan Day | 5–3 | Neil Robertson | |
| 4–5 | Adrian Rosa | ||
| Adrian Gunnell | 5–3 | Paul Sweeny | |
| Atthasit Mahitthi | 5–4 | Andy Neck | |
| 4–5 | Ian Sargeant | ||
| 4–5 | Tom Ford |