G. S. Jayanath (, died 4 December 1997), was a Major in the Sri Lanka Army and a member of the army's elite Commando Regiment. He posthumously received the Parama Weera Vibhushanaya, the country's highest military award for gallantry, for his actions during Operation Jayasikurui in the Sri Lankan Civil War. Jayanath is the only Commando to receive this decoration.