Denys Serhiyovych Kesil (Ukrainian: Денис Сергійович Кесіль; born 26 October 2000) is a Ukrainian swimmer. He represented Ukraine at the 2019 World Aquatics Championships held in Gwangju, South Korea. In the same year, he won the silver medal in the men's 200 metre butterfly event at the 2019 Military World Games held in Wuhan, China. In 2018, he represented Ukraine at the Summer Youth Olympics in Buenos Aires, Argentina. He won the silver medal in the boys' 200 metre butterfly event. He also competed in the boys' 50 metre butterfly and boys' 100 metre butterfly events.