Santiago Pérez Alonso (born 12 January 1972 in Vigo, Pontevedra) is a Spanish race walker.
| Representing | |||||
|---|---|---|---|---|---|
| 1997 | World Race Walking Cup | Poděbrady, Czech Republic | 21st | 50 km | 3:54:28 |
| World Championships | Athens, Greece | 21st | 50 km | 4:05:25 | |
| 1998 | Budapest, Hungary | 6th | 50 km | 3:48:17 | |
| 1999 | World Race Walking Cup | Mézidon-Canon, France | 14th | 50 km | 3:48:27 |
| World Championships | Seville, Spain | 26th | 50 km | 4:11:30 | |
| 2000 | Eisenhüttenstadt, Germany | 8th | 50 km | 3:51:24 | |
| bgcolor=silver | 2nd | Team - 50 km | 15 pts | ||
| 2001 | Dudince, Slovakia | 4th | 50 km | 3:46:52 | |
| bgcolor=silver | 2nd | Team - 50 km | 21 pts | ||
| 2002 | Munich, Germany | 12th | 50 km | 3:55:50 | |
| 2004 | Olympic Games | Athens, Greece | 8th | 50 km | 3:49:48 |
| World Race Walking Cup | Naumburg, Germany | 8th | 50 km | 3:52:58 | |
| 2007 | World Championships | Osaka, Japan | — | 50 km | DNF |
| 2008 | World Race Walking Cup | Cheboksary, Russia | 33rd | 50 km | 4:02:09 |
| Olympic Games | Beijing, China | 26th | 50 km | 3:59:41 | |
| 2009 | European Race Walking Cup | Metz, France | 16th | 50 km | 4:08:17 |
| 3rd | Team - 50 km | 38 pts | |||