Rathna Gamage (born 27 January 1972) is a Sri Lankan teacher and politician. He was elected to the Parliament of Sri Lanka from the Galle District as a member of the National People's Power. He is a member of the Janatha Vimukthi Peramuna (JVP) and currently serves as the Deputy Minister of Fisheries, Aquatic, and Ocean Resources in president Anura Kumara Dissanayake's cabinet.

Gamage received his primary education at Manavila Upananda National School in Galle. He then attended St. Aloysius' College, Galle, for his secondary education. He pursued higher education at the University of Ruhuna, studying physical science, but did not complete his degree.

Gamage is a government Piriven teacher, teaching 11th grade at Vidhya Pradeepa Pirivena in Manavila, Galle. He also works as a tuition class teacher, specializing in Ordinary Level (O/L) Science and Advanced Level (A/L) Physics.

Gamage has been a full-time member of the JVP since 2004. His political career includes:

Rathna Gamage married in 2006.^{[citation needed]}