Thomas Pidcock (born 30 July 1999) is a British cyclist who competes in the cyclo-cross, mountain bike and road bicycle racing disciplines of the sport for the Swiss Pinarello–Q36.5 Pro Cycling Team. Prior to his release in December 2024, he rode for UCI WorldTeam Ineos Grenadiers.

After a prodigious junior and under-23 career with World Championship victories in all three of these disciplines, Pidcock turned professional in 2021. Since then his biggest victories have been taking the cross-country mountain bike titles at the 2020 Summer Olympics, the 2022 and 2025 European Championships cross-country titles, the 2023 World Championships cross-country, and retaining the Olympic title in 2024, becoming only the second man to win back to back Olympic titles; in the cyclo-cross discipline, winning the 2022 Cyclo-cross World Championships, to back up world titles at Junior and Under-23 level, while on the road he has won the prestigious spring road classics, Strade Bianche in 2023 and the Amstel Gold Race in 2024. His best Monument finish was 2nd in Liège–Bastogne–Liège in 2023.

Across all three disciplines, he has won numerous other races, with his biggest victory on the road in his first season being the 2021 Brabantse Pijl road classic. While his early successes on the road have been in classics, in his second season, riding his first Tour de France in 2022, he took his first Grand Tour stage, winning solo on the climb of Alpe d'Huez, the youngest rider ever to do so. He is also known for his aggressive descending skills.