The men's 100 metre backstroke event at the 2024 Summer Olympics was held from 28 to 29 July 2024 at Paris La Défense Arena.

At the 2023 World Championships, the USA's Ryan Murphy won gold ahead of Ceccon in second.

[2][a] Other contenders included Xu Jiayu, the 2016 Olympic silver medallist and a double world champion; Hugo González of Spain, who swam a personal best of 52.70 at the 2024 Championships; and Apostolos Christou of Greece, who won the 2024 European Championships with a time of 52.23.

[10][11] Finally, the rest of the spaces were filled by athletes who had met the Olympic Consideration Time (OCT), which was 54.01 for this event.

[13] Hungary's Hubert Kós swam the fastest qualifying time of 52.78, which broke his own national record.

His closing 50 metre split was the slowest in the field, but he held on to win the silver medal with a time of 52.32.