Admiral Jayanath Colombage, RSP, VSV, USP, FNI is a Sri Lankan flag officer and diplomat.

Colombage holds a Master of Science in Defence Studies from the University of Madras, a Master of Arts in International Studies from King's College London and a PhD from General Sir John Kotelawala Defence University.

He has gained Diplomas in Security Studies, Conflict Resolution, International Affairs and Information Technology.

He is a weapon specialist who has undergone extensive training with the Indian Navy and in the People's Republic of China.

He has published a book titled ‘Naval Terms and Expressions’ and actively contributes to various academic forums.

Following his retirement from the navy, Colombage worked as the Director for Indo-Sri Lanka initiatives and law of the sea centers at the Pathfinder Foundation, a Colombo-based think tank.

[5] In February 2020, he was appointed Director General of the Institute of National Security Studies of Sri Lanka.