Kanagaratnam Thavalingam is a Sri Lankan Tamil geographer and former Surveyor General of Sri Lanka.
Thavalingam is from Kaithady in northern Sri Lanka. He was educated at the Jaffna Hindu College. He is a fellow of the Surveyors Institute (of Sri Lanka) and a member of the institute's council.
Thavalingam was Senior Deputy Surveyor General and Additional Surveyor General. He became the 45th Surveyor General in 2013.