Karl Kustav Kalkun (April 9, 1927 Tartu – February 21, 1990 Tallinn) was an Estonian actor. Karl Kalkun was born in Tartu as one of three children to.

Karl Kalkun Sr., a stage manager of the Vanemuine theatre, and Emma Helene Kalkun (née Engelbär). He was the nephew of discus and hammer thrower Gustav Kalkun.