Kaluachchigamage Jayatillake (Sinhala: ??.??????; 27 June 1926 – 14 September 2011), known as K.Jayatillake, is a Sinhala novelist and literary critic.
He was born in Kannimahara, Gampaha District, Sri Lanka and was a contemporary of Mahagama Sekara having studied in the same school.
He married Sumana Jayatillake and is the father of four children.
K Jayatilake is one of Sri Lanka's topmost creative writers of the modern period of Sinhala literature.
Using his close observations of village life, Jayatilake was a pioneer in the Sinhalese realistic novel.
His first creative work, Punaruppattiya, a collection of short stories published in 1955, was well received.
His award-winning novel and acknowledged masterpiece, Charitha Thunak, published in 1963, begins with a scene of peasants working in the field, evoking the intimate relationship between the villager and the earth.
In this and other novels, Jayatilake reminds us also of the close-knit society of the village that is guided by common values.