William Clarke (born 11 April 1985) is an Australian professional road racing cyclist, who most recently rode for UCI WorldTeam Trek–Segafredo.

[3] He is not related to fellow Australian cyclist and past teammate Simon Clarke.

Clarke was born, raised, and resides on his family's 8,100-hectare (20,000-acre) farm near Campbell Town, Tasmania, Australia.

[4] He moved to a UCI ProTeam full-time in 2011 for Leopard Trek,[5] before spending a season at both Champion System in 2012,[6] and Argos–Shimano in 2013.

[8] After three seasons with Drapac Professional Cycling, Clarke returned to the World Tour with Cannondale–Drapac, riding with them until the end of 2018.