Ilya Syarheyevich Shymanovich (; born 2 August 1994) is a Belarusian swimmer. He is the world record holder in the short course 100 metre breaststroke and a former world record holder in the short course 50 metre breaststroke. At the 2018 World Championships he won two silver medals, one each in the 100 metre breaststroke and the 50 metre breaststroke. He won two gold medals, one in the 50 metre breaststroke and one in the 200 metre breaststroke, and a silver medal, in the 100 metre breaststroke, at the 2021 European Short Course Championships. At the 2021 World Short Course Championships he won the gold medal in the 100 metre breaststroke.
Career
2017 World Championships
At the 2017 World Aquatics Championships in Budapest, Hungary, Shymanovich competed in the men's 50 metre breaststroke event.
2018 World Championships
Competing on the global level at the 2018 World Short Course Championships in Hangzhou, China, Shymanovich won his first medal of the meet in the 100 metre breaststroke, finishing in a time of 56.10 seconds that was nine hundredths of a second behind the gold medalist and then-world-record-holder in the event Cameron van der Burgh of South Africa to earn the silver medal. In his next individual event, the 200 metre breaststroke, Shymanovich placed twelfth overall with a time of 2:04.85 in the prelims heats, which did not advance him to the final. For his final individual event, the 50 metre breaststroke, Shymanovich once again won the silver medal, placing second with a time of 25.77 seconds only behind Cameron van der Burgh.
2020 Belarus National Championships
In December 2020, at the short course Belarus National Championships in Brest, Shymanovich swam a world record time of 55.34 seconds in the 100 metre breaststroke, breaking the world record of 55.41 seconds set by Adam Peaty of Great Britain approximately one month earlier.
2020 European Championships
At the 2020 European Aquatics Championships held in Budapest, Hungary in May 2021 and conducted in long course metres, Shymanovich competed in the 50 metre breaststroke winning the silver medal in the event with a time of 26.55 seconds, which was less than four tenths of a second behind the gold medalist in the event, Adam Peaty of Great Britain.
2021 European Short Course Championships
Shymanovich won the gold medal and tied the world record of 25.25 seconds in the 50 metre breaststroke, set in 2009 by Cameron van der Burgh of South Africa, on the last day of the 2021 European Short Course Swimming Championships, held at the Palace of Water Sports in Kazan, Russia in November. His time of 25.25 seconds also set a new European record, Belarusian record, and Championships record in the event. He backed up his world record in the 50 metre breaststroke on the finals relay in the mixed 4x50 metre medley relay, where he swam the fastest 50 metre breaststroke relay split in history with a time of 24.72 seconds and helped the relay place fifth overall.
Earlier in the Championships meet and leading up to his world record, Shymanovich set a new Championships record in the 100 metre breaststroke in the semifinals with a time of 55.45 seconds that advanced him to the final ranked first. In the final of the 100 metre breaststroke he swam a 55.77 and earned the silver medal in the event, with neither him nor the gold medalist, Nicolò Martinenghi of Italy, matching nor surpassing his time from the semifinals in the final, meaning his Championships record remained unbroken through the Championships. After his silver medal win in the 100 metre breaststroke and before his gold medal win in the 50 metre breaststroke, Shymanovich won his first gold medal of the Championships in the 200 metre breaststroke with a time of 2:01.73 in the final. Shymanovich equalling the world record in the 50 metre breaststroke was ranked as number one for "The Week That Was" honor from Swimming World for the week of 8 November 2021 along with Szebasztián Szabó of Hungary equalling the world record in the 50 metre butterfly.