| Roles | Competed in Olympic Games |
|---|---|
| Sex | Male |
| Full name | Guilherme•Pereira da Costa |
| Used name | Guilherme•Costa |
| Nick/petnames | Cachorrão |
| Born | 1 October 1998 in Itaguaí, Rio de Janeiro (BRA) |
| Measurements | 185 cm / 72 kg |
| Affiliations | Minas Tênis Clube, Belo Horizonte (BRA) / Unisanta, Santos (BRA) |
| NOC |  Brazil |
| Games | Discipline (Sport) / Event | NOC / Team | Pos | Medal | As | |
|---|---|---|---|---|---|---|
| 2020 Summer Olympics | Swimming (Aquatics) | BRA |
Guilherme Costa | |||
| 400 metres Freestyle, Men (Olympic) | 11 | |||||
| 800 metres Freestyle, Men (Olympic) | 8 | |||||
| 1,500 metres Freestyle, Men (Olympic) | 13 | |||||
| 2024 Summer Olympics | Marathon Swimming (Aquatics) | BRA |
Guilherme Costa | |||
| 10 kilometres, Men (Olympic) | ||||||
| Swimming (Aquatics) | BRA |
Guilherme Costa | ||||
| 200 metres Freestyle, Men (Olympic) | ||||||
| 400 metres Freestyle, Men (Olympic) | 5 | |||||
| 800 metres Freestyle, Men (Olympic) | 20 | |||||
| 4 × 200 metres Freestyle Relay, Men (Olympic) | Brazil | 12 |
