Alison Brendom Alves dos Santos (born 3 June 2000)[3] is a Brazilian athlete specialising in the 400 metres hurdles.

Alison Brendom Alves dos Santos was born on 3 June 2000 in São Joaquim da Barra, Brazil to father Gerson and mother Sueli.

[9] While he was at his grandmother Geni's house one day, she warmed up a pan of hot oil to fry fish.

[7][8][10][11] Alison was shy growing up, partly due to his scars, and stayed in his room alone until he started to become involved in sports.

[13] Although he loved judo, the high cost associated with each training session caused him to abandon it in favour of athletics.

Alison began athletics in 2013 at Pedro Badran State Technical School (ETEC) and was coached by Ana Fidélis.

[11][12] Within months, he no longer did athletics out of a financial need but because he truly enjoyed it and even made friends throughout the city, states, and country.

[14] In September 2019, Dos Santos went to the 2019 World Athletics Championships in Doha, Qatar, where he won the 400m hurdles semifinal in 48.35, breaking his personal record again and going to the final with the second best overall time.

Dos Santos obtained the 47.68 mark in the Mt.Sac stage of the Continental Athletics Tour in California (USA).

[20] At the delayed 2020 Summer Olympics in Tokyo, Alison qualified for the final of the 400 metres hurdles, breaking the South American record with a time of 47.31.

[25] In May 2022 he won a gold medal in the Doha stage of the Diamond League with a time of 47.24, defeating Rai Benjamin.

[37][38] Close to a week after, he improved upon this when he ran the 400m hurdles in the Monaco stage of the Diamond League and finished in second place on 21 July 2023.

[41] On 31 May, at the Oslo stage of the Diamond League, he defeated Warholm within his country and took the lead in the 400m hurdles ranking for the year, with a time of 46.63.

[42] In September 2024, it was announced that he had signed up for the inaugural season of the Michael Johnson founded Grand Slam Track.