Kumarasiri is a given name and surname. Notable people with the name include:
Kumarasiri Rathnayake (born 1967), Sri Lankan teacher and politician Ananda Kumarasiri (born 1954), Sri Lankan politician K. P. S. Kumarasiri (), Sri Lankan politician P. Kumarasiri (1919-2004), Sri Lankan politician P. D. J. Kumarasiri (), Sri Lankan engineer