Thomas Seller Wallace, MM (1896 – October 8, 1935) was a British-born Canadian police officer who was killed in the 1935 Royal Canadian Mounted Police Killings. On 8 October 1935, Wallace was shot in the chest by one of the fugitives in the incident on the outskirts of Banff, Alberta, succumbing to his wounds later that day. He had previously earned a distinguished service record in the British Army during World War I. He emigrated to Canada and joined the Alberta Provincial Police after the war in 1921, before it was amalgamated with the Royal Canadian Mounted Police by 1932 and had been a law enforcement officer in Alberta for 14 years before his death.