| Roles | Competed in Olympic Games | |
|---|---|---|
| Sex | Male | |
| Full name | Guillermo Rafael•Pacheco Urdaneta | |
| Used name | Guillermo•Pacheco | |
| Born | 23 December 1954 in Caracas, Distrito Capital |  VEN |
| Measurements | 183 cm / 70 kg | |
| NOC | Peru |  PER |
| Games | Discipline (Sport) / Event | NOC / Team | Pos | Medal | As | |
|---|---|---|---|---|---|---|
| 1972 Summer Olympics | Swimming (Aquatics) | PER |
Guillermo Pacheco | |||
| 400 metres Freestyle, Men (Olympic) | 29 | |||||
| 1,500 metres Freestyle, Men (Olympic) | 34 |
