Cyril Percy Callister (16 February 1893 – 5 October 1949) was an Australian chemist and food technologist who developed the Vegemite yeast spread.

After 53 days, however, he was withdrawn from active service on the order[6] of the Minister for Defence and assigned to the Munitions Branch, making explosives in Britain due to his knowledge of chemistry.

[9] Following the end of World War I, he met and married Scottish girl Katherine Hope Mundell[8] and returned to Australia and resumed employment with Lewis & Whitty in 1919.

In the early 1920s, Callister was employed by Fred Walker and given the task of developing a yeast extract, as imports from the United Kingdom of Marmite had been disrupted in the aftermath of World War I.

[2] Callister died at his home in Wellington Street, Kew, Melbourne in 1949, following a heart attack and is buried at Box Hill Cemetery.