Ian Clarke may refer to:Ian Clarke, Irish computer programmer, the original designer and lead developer of Freenet Ian Clarke (physician), Irish-born physician, missionary, philanthropist, businessman, resident of Uganda Ian Clarke (flautist), British classical flute player and composer Ian Clarke (gymnast), Australian Olympic gymnast Ian Clarke (drummer), drummer with the group Uriah Heep from 1970 to 1971 and Cressida Ian Clarke (1931–1997), New Zealand rugby player, farmer and rugby administrator Ian Clarke (soccer), Canadian soccer player I. F. Clarke (1918–2009), known as Ian, British bibliographer and literary scholar