Thomas Sinclair Harrison
  • Country: South Africa
  • Rank: Captain
  • Service: Royal Flying Corps Royal Air Force
  • Units: 29
  • Victories: 22
  • Date Of Birth: January 8, 1898
  • Place of Birth: King William Town

Having served with an artillery regiment in German East Africa, Harrison joined the Royal Flying Corps in April of 1917. He was assigned to 29 Squadron on the Western Front in May of 1918. Flying the S.E.5a, Harrison became the highest scoring ace in his squadron. During World War II, Major Harrison was an intelligence officer in the South African Air Force.