Theodore Lionel Sourkes, OC FRSC (February 21, 1919 – January 17, 2015) was a Canadian biochemist and neuropsychopharmacologist who helped advance the treatment of Parkinson's disease and hypertension. He died of pneumonia on January 17, 2015 at the Montreal General Hospital. He was buried at the Montreal Workers' Circle section of the Baron de Hirsch Cemetery, Montreal. "His archives are held at McGill University in the Osler Library of the History of Medicine