Ian Clarke
Ian Clarke may refer to:
- Ian Clarke (computer scientist), 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 (rugby union), New Zealand rugby player, farmer and rugby administrator
- Ian Clarke (soccer), Canadian soccer player
- I. F. Clarke, known as Ian, British bibliographer and literary scholar