Kaliyugaya (Sinhala, Age of Darkness) is a novel written by Sinhala writer Martin Wickremasinghe and first published in 1957. It is the second book of Wickremasinghe's trilogy that started with Gamperaliya - transformation of a village. The final book of the trilogy is Yuganthaya (culmination of the era).
It was adapted into a movie by Lester James Peries in 1981.
The story depicts the lives of Nanda and Piyal after marriage and their children.