Major General Susantha Mendis USP, SLSR (1950 – 11 Sepy 1998) was a Sri Lankan General, who was the former Commanding Officer of 51-2 Brigade based in Jaffna.
After finishing school he joined the army as an officer cadet and was commissioned as a Second Lieutenant in the Sinha Regiment.
During his career he held many positions within the army including that of Commanding Officer, 1st Battalion, Sri Lanka Singh Regiment. Brigadier Mendis was Commanding Officer of 51-2 Brigade attached to the 51 Division.
On 11 September 1998, he attended a meeting at the office of the Mayor of Jaffna to discuss trafic arrangements in the town of Jaffna. The LTTE detonated a bomb in the office killing 12 persons including Brigadier Mendis, Mayor Pon Sivapalan, SSP Chandra Perera, an Army Captain and four police officers. Also killed were S Pathamanathan, Commissioner for Rehabilitation of the Jaffna Municipality and Architect Mallika Rajaratnam. Brigadier Mendis was posthumously promoted to the rank of Major General.