Kolonnawa (, ) is a town located on the eastern boundary of Colombo, Sri Lanka. It is bounded by Kelani River to the north, Kotikawatta-Mulleriyawa Pradeshiya Sabha to the east, Kotte Municipal Council to the south and Colombo Municipal Council to the west.
Kolonnawa Municipality area is a multi-ethnic, multi-religious urban centre. According to the census of 2012, the demographics by ethnicity and religion are as follows: