Kala Keerthi Carl Muller (22 October 1935 – 2 December 2019) was an award-winning Sri Lankan writer, poet and journalist best known for his trilogy about Burghers in Sri Lanka: The Jam Fruit Tree, Yakada Yaka and Once Upon A Tender Time.
He won Gratiaen Awards for The Jam Fruit Tree in 1993 and a State Literary Award for his historical novel, Children of the Lion.
He was the first Sri Lankan author to publish a book internationally.
He was reported to have died on 2 December 2019 which was confirmed by his son Jeremy Muller.