| Óscar Husillos | |
| Fullname: | Óscar Husillos Domingo |
| Birth Date: | 18 July 1993 |
| Birth Place: | Palencia, Spain |
| Height: | 1.80 m |
| Weight: | 66 kg |
| Country: | Spain |
| Sport: | Athletics |
| Event: | 200 metres, 400 metres |
| Club: | C.A. Adidas |
| Coach: | Luis Ángel Caballero |
Óscar Husillos Domingo (born 18 July 1993) is a Spanish sprinter specialising in the 200 and 400 metres. He won the gold medal in the 400 m at the 2021 European Indoor Championships and a silver at the 2019 European Indoor Championships.
Husillos is the Spanish indoor record holder for the 200 m, 300 m and 400 m. He won multiple national titles both outdoors and indoors.
| 2012 | World Junior Championships | Barcelona, Spain | 22nd (h) | 200 m | 21.82 | |
| 17th (h) | 4 × 100 m relay | 41.08 | ||||
| 2014 | IAAF World Relays | Nassau, Bahamas | – | 4 × 200 m relay | DQ | |
| Mediterranean U23 Championships | Aubagne, France | 6th | 200 m | 21.75 | ||
| 2016 | European Championships | Amsterdam, Netherlands | 9th (h) | 4 × 100 m relay | 39.15 | |
| 2017 | European Indoor Championships | Belgrade, Serbia | 9th (sf) | 400 m | 47.83 | |
| European Team Championships Super League | Lille, France | 8th | 200 m | 20.97 | ||
| bgcolor=gold | 1st | 4 × 400 m relay | 3:02.32 | |||
| World Championships | London, United Kingdom | 14th (sf) | 400 m | 45.16 | ||
| 5th | 4 × 400 m relay | 3:00.65 | ||||
| 2018 | World Indoor Championships | Birmingham, United Kingdom | 1st (sf) | 400 m | 45.691 | |
| European Championships | Berlin, Germany | 6th | 400 m | 45.61 | ||
| 3rd | 4 × 400 m relay | 3:00.78 | ||||
| 2019 | European Indoor Championships | Glasgow, United Kingdom | bgcolor=silver | 2nd | 400 m | 45.66 |
| bgcolor=silver | 2nd | 4 × 400 m relay | 3:06.32 | |||
| European Team Championships Super League | Bydgoszcz, Poland | 3rd | 400 m | 46.36 | ||
| 4th | 4 × 400 m relay | 3:04.52 | ||||
| World Championships | Doha, Qatar | 14th (h) | 4 × 400 m relay | 3:04.27 | ||
| 2021 | European Indoor Championships | Toruń, Poland | bgcolor=gold | 1st | 400 m | 46.22 |
| World Relays | Chorzów, Poland | 13th (h) | 4 × 400 m relay | 3:06.09 | ||
| Olympic Games | Tokyo, Japan | 43rd (h) | 400 m | 48.05 | ||
| 2022 | Ibero-American Championships | La Nucía, Spain | bgcolor=silver | 2nd | 4 × 400 m relay | 3:04.05 |
| World Championships | Eugene, OR, United States | 11th (h) | Mixed 4 × 400 m relay | 3:16.14 | ||
| European Championships | Munich, Germany | 24th (h) | 400 m | 46.42 | ||
| 4th | 4 × 400 m relay | 3:00.54 | ||||
| 2023 | European Indoor Championships | Istanbul, Turkey | 4th | 400 m | 46.24 | |
| 4th | 4 × 400 m relay | 3:06.87 | ||||
| European Games | Chorzów, Poland | 15th | Mixed 4 × 400 m relay | 3:16.79 | ||
| World Championships | Budapest, Hungary | 15th (h) | 4 × 400 m relay | 3:02.64 | ||
| 2024 | European Championships | Rome, Italy | 5th | 4 × 400 m relay | 3:01.44 |