Susantha Mendis, USP (1951 – 11 September 1998) was a Sri Lanka Army general, who was the former Commanding Officer of 51-2 Brigade based in Jaffna.

During his career he held many positions within the army including that of Commanding Officer, 1st Battalion, Sri Lanka Singh Regiment.

The Liberation Tigers of Tamil Eelam (LTTE) detonated a bomb in the office killing 12 persons including Brigadier Mendis, Mayor Pon Sivapalan, SSP Chandra Perera, Captain Ramanayaka, the Brigadier's Principal Staff Officer (PSO) 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.