| 2003 WGC-American Express Championship | |
| Dates: | October 2–5, 2003 |
| Location: | Woodstock, Georgia, U.S. |
| Course: | Capital City Club's (Crabapple Course) |
| Tour: | PGA Tour European Tour |
| Par: | 70 |
| Yardage: | 7,189 |
| Field: | 72 players |
| Cut: | None |
| Purse: | $6,000,000 |
| Winners Share: | $1,050,000 |
| Score: | 274 (−6) |
| Previous: | 2002 |
| Next: | 2004 |
The 2003 WGC-American Express Championship was a golf tournament that was contested from October 2–5, 2003 over the Capital City Club's Crabapple Course in Woodstock, Georgia. It was the fourth WGC-American Express Championship tournament and the third of four World Golf Championships events held in 2003.
World number 1 Tiger Woods won the tournament to capture his third WGC-American Express Championship and his seventh World Golf Championships title.
| Place | Player | Score | To par | |
|---|---|---|---|---|
| 1 |  Sergio García | align=center | 65 | −5 |
| T2 |  Tim Herron | 66 | −4 | |
| Rocco Mediate | ||||
| T4 |  K. J. Choi | 67 | −3 | |
| Tiger Woods | ||||
| T6 |  Niclas Fasth | 68 | −2 | |
| Ignacio Garrido | ||||
| T8 | Darren Clarke | 69 | −1 | |
 Peter O'Malley | ||||
 Jyoti Randhawa | ||||
| Loren Roberts | ||||
 Mike Weir |
| Place | Player | Score | To par | |
|---|---|---|---|---|
| 1 | Tiger Woods | align=center | 67-66=133 | −7 |
| T2 | K. J. Choi | align=center | 67-71=138 | −2 |
| Sergio García | align=center | 65-73=138 | ||
| Tim Herron | align=center | 66-72=138 | ||
| Rocco Mediate | align=center | 66-72=138 | ||
| T6 | Stuart Appleby | align=center | 71-68=139 | −1 |
| Ignacio Garrido | align=center | 68-71=139 | ||
| 8 | Vijay Singh | align=center | 70-70=140 | E |
| T9 |  Retief Goosen | align=center | 73-69=142 | +2 |
| Jerry Kelly | align=center | 70-72=142 | ||
| Mike Weir | align=center | 69-73=142 |
| Place | Player | Score | To par | |
|---|---|---|---|---|
| 1 | Tiger Woods | align=center | 67-66-69=202 | −8 |
| 2 | Vijay Singh | align=center | 70-70-64=204 | −6 |
| 3 | Tim Herron | align=center | 66-72-67=205 | −5 |
| 4 | K. J. Choi | align=center | 67-71-68=206 | −4 |
| T5 | Stuart Appleby | align=center | 71-68-69=208 | −2 |
| Sergio García | align=center | 65-73-70=208 | ||
| Ignacio Garrido | align=center | 68-71-69=208 | ||
| 8 | Retief Goosen | align=center | 73-69-67=209 | −1 |
| 9 | Paul Casey | align=center | 73-71-66=210 | E |
| T10 | Rocco Mediate | align=center | 66-72-73=211 | +1 |
| Jerry Kelly | align=center | 70-72-69=211 |
| Place | Player | Score | To par | Winnings ($) |
|---|---|---|---|---|
| 1 | Tiger Woods | 67-66-69-72=274 | −6 | 1,050,000 |
| T2 | 71-68-69-68=276 | −4 | 405,000 | |
| 66-72-67-71=276 | ||||
| 70-70-64-72=276 | ||||
| 5 | 73-72-67-65=277 | −3 | 235,000 | |
| T6 | 67-71-68-73=279 | −1 | 182,500 | |
| 71-73-69-66=279 | ||||
| T8 | 73-71-66-71=281 | +1 | 137,500 | |
| 73-69-67-72=281 | ||||
| T10 | 71-73-70-68=282 | +2 | 111,250 | |
| 68-71-69-74=282 |