| Tournament Name: | 2003 British Open |
| Venue: | Brighton Centre |
| Location: | Brighton |
| Country: | England |
| Organisation: | WPBSA |
| Format: | Ranking event |
| Total Prize Fund: | £450,000 |
| Winners Share: | £52,000 |
| Highest Break: | (147) |
| Score: | 9–6 |
| Previous: | 2002 |
| Next: | 2004 |
The 2003 British Open was the 2003 edition of the British Open professional ranking snooker tournament, that was held from 8–16 November 2003 at the Brighton Centre, Brighton, England. Stephen Hendry won the tournament by defeating Ronnie O'Sullivan nine frames to six in the final. The final saw a record 5 centuries in a row from the two players (three from O'Sullivan and two from Hendry, including a 135), which remains a joint record for consecutive centuries made between two players in a professional tournament match and is a standalone record for ranking events and finals.__TOC__
The breakdown of prize money for this year is shown below:[1] Winner: £52,000
Runner-up: £26,000
Semi-final: £13,000
Quarter-final: £9,500
Last 16: £7,450
Last 32: £5,600
Last 48: £3,900
Last 64: £2,750Last 80: £1,750
Last 96: £1,100
Stage one highest break: £1,800
Stage two highest break: £5,000
Stage one maximum break: £5,000
Stage two maximum break: £20,000
Total: £450,000
| Final: Best of 17 frames. Referee: Eirian Williams. Brighton Centre, Brighton, England. 16 November 2003. | |||
| Ronnie O'Sullivan (4) | 6–9 | Stephen Hendry (3) | |
| Afternoon: 103–29 (62),,,,,,, Evening: 28–84 (61),,,,,, | |||
| 109 | Highest break | 135 | |
| 3 | Century breaks | 3 | |
| 7 | 50+ breaks | 7 | |
Qualifying for the tournament took place at Pontins in Prestatyn, Wales between 21 and 25 September 2003.
Best of 9 frames
| Kwan Poomjang | 5–4 | Stephen Croft | |
| Andrew Norman | 5–2 | Ian Sargeant | |
| Wayne Brown | 5–1 | Chris Melling | |
| Ryan Day | 5–3 | Supoj Saenla | |
| Paul Wykes | 5–2 | Garry Hardiman | |
| 1–5 | Steve Mifsud | ||
| Billy Snaddon | 5–4 | James Leadbetter | |
| Luke Fisher | 5–2 | Ding Junhui | |
| Andrew Higginson | 5–2 | Stuart Mann | |
| 1–5 | Neil Robertson | ||
| Craig Butler | 5–2 | Paul Sweeny | |
| 3–5 | Philip Williams | ||
| w/d–w/o | Gary Thomson | ||
| Paul Davies | 5–1 | Kurt Maflin | |
| 4–5 | Michael Wild | ||
| Munraj Pal | 5–4 | Carlo Giagnacovo |
| Martin Dziewialtowski | 5–2 | Joe Delaney | |
| Bradley Jones | 5–1 | Luke Simmonds | |
| 4–5 | Michael Rhodes | ||
| 2–5 | Tom Ford | ||
| Rory McLeod | 5–3 | Andy Neck | |
| Johl Younger | 5–1 | Steven Bennie | |
| Jamie Cope | 5–4 | Mehmet Husnu | |
| Matthew Couch | 5–4 |  Liu Song | |
| Ricky Walden | 5–0 | Martin Gould | |
| 4–5 | Darryn Walker | ||
| Adrian Gunnell | 5–3 | Ian Preece | |
| w/d–w/o | Alain Robidoux | ||
| Peter Lines | 5–1 | Scott MacKenzie | |
| Atthasit Mahitthi | 5–2 | Ian Brumby | |
| 0–5 | Adrian Rosa | ||
| Colm Gilcreest | 5–4 | Joe Meara |