| Tournament information | |
|---|---|
| Dates | 24–27 July 2003 |
| Location | South Ayrshire, Scotland 55°18′58″N 4°49′59″W / 55.316°N 4.833°W |
| Course(s) | Turnberry |
| Organised by | The R&A |
| Tour(s) | |
| Format | 72 holes stroke play |
| Statistics | |
| Par | 70 |
| Length | 6,715 yd (6,140 m) |
| Field | 144 players, 77 after cut |
| Cut | 144 (+4) |
| Prize fund | US$1,590,377 |
| Winner's share | US$255,731 €222,779 |
| Champion | |
 Tom Watson | |
| 263 (−17) | |
| Location map | |
The 2003 Senior British Open was a senior major golf championship and the 17th Senior British Open, held from 24–27 July at Turnberry in South Ayrshire, Scotland. It was the 5th Senior British Open played at the course and the first Senior British Open played as a senior major championship.
Tom Watson defeated Carl Mason in a playoff to win his first Senior British Open title and his second senior major championship victory.