Ian Clarke may refer to:

• Ian Clarke (computer scientist) (born 1977), Irish computer programmer, the original designer and lead developer of Freenet
• Ian Clarke (physician) (born 1952), Irish-born physician, missionary, philanthropist, businessman, resident of Uganda
• Ian Clarke (flautist) (born 1964), British classical flute player and composer
• Ian Clarke (gymnast) (born 1946), Australian Olympic gymnast
• Ian Clarke (drummer) (born 1946), drummer with the group Uriah Heep from 1970 to 1971 and Cressida
• Ian Clarke (rugby union) (1931–1997), New Zealand rugby player, farmer and rugby administrator
• Ian Clarke (soccer) (born 1975), Canadian soccer player
• I. F. Clarke (1918–2009), known as Ian, British bibliographer and literary scholar

• Ian Clark (disambiguation)

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