Nandika Sanath Kumanayake () is the current Secretary to the President of Sri Lanka.
Kumanayake joined the civil service as an Assistant Superintendent of Sri Lanka Customs in 1997. He was appointed Secretary to the President, the de-facto head of Sri Lanka's civil service after the election of Anura Kumara Dissanayake in 2024. He was a Deputy Director of Customs at the time of appointment.