Ian Duncan

Ian Duncan may refer to:
 * Ian Duncan (rally driver) (born 1961), rally driver from Kenya
 * Ian Duncan, Baron Duncan of Springbank (born 1973), British politician
 * Ian Duncan (businessman), businessman active in the Australian resources sector
 * Ian Duncan (actor), South African actor
 * Ian Duncan (oncologist) (born 1943), British gynecological oncologist
 * Ian Duncan (Community), a character in Community