Gregorio Paltrinieri is an Italian competitive swimmer. He is a former world record holder in the short course 1500 metre freestyle. He holds the European record in the long course 800 metre and 1500 metre freestyle events with times of 7:39.27 and 14:32.80, respectively. In the 1500 metre freestyle, he is a 2016 Olympic, three-time world long course, two-time world short course, three-time European long course, and three-time European short course champion. In the 800 metre freestyle, he is a 2019 world long course, 2022 world short course, three-time European long course, and 2021 European short course champion. In the 10 kilometre open water swim, he is a 2022 world and 2020 European champion. In the 5 kilometre open water swim, he is a two-time European champion.

The 12th FINA World Swimming Championships (25m) were held in Doha, Qatar on 3–7 December 2014. The Hamad Aquatic Centre in the Aspire Zone hosted the event.