Leonardo Gomes de Deus (born 18 January 1991 in Campo Grande) is a Brazilian swimmer.

[11] Deus was at the 2011 Pan American Games in Guadalajara, where he was crowned champion of the 200-metre butterfly after a controversy involving alleged irregular sponsorship in the cap used in the final.

[17] At the 2014 South American Games in Santiago, Chile, he won two gold medals in the 200-metre butterfly and 200-metre backstroke, breaking the competition record in both races.

[20] At the 2014 Pan Pacific Swimming Championships in Gold Coast, Queensland, Australia, he won a silver medal in the 200-metre butterfly with a time of 1:55.28.

[30][31] At the 2015 World Aquatics Championships in Kazan, de Deus didn't swim well in the Men's 200 metre butterfly.

[36] At the 2016 FINA World Swimming Championships (25 m) in Windsor, Ontario, Canada, he went to the Men's 200 metre butterfly final, finishing 5th.

[40] At the 2018 Pan Pacific Swimming Championships in Japan, he won a silver medal in the 200-metre butterfly, with a time of 1:54.89, his personal record.

[41] At the 2018 FINA World Swimming Championships (25 m) in Hangzhou, China, the Brazilian team composed by Luiz Altamir Melo, Fernando Scheffer, Leonardo Coelho Santos and Breno Correia won the gold medal in the 4 × 200 freestyle relay, breaking the world record, with a time of 6:46.81.

At the 2020 Summer Olympics in Tokyo, Leonardo de Deus qualified for the semifinals of the Men's 200 metre butterfly in third place, with a time of 1:54.83.

[54] At the 2022 World Aquatics Championships held in Budapest, Hungary, he did not have a good run in the 200m butterfly, finishing in 14th place with a time of 1:56.18.