John Sheldon Olliff (1 December 1908 – 29 June 1951) was an English tennis player, author and sports journalist.

In doubles, he reached the semifinals with his partner Ronnie Shayes where they lost to Harold Hare and Frank Wilde.

In addition he won single titles at the Westgate-on-Sea Tournament (1938) on hard asphalt.

After the Second World War, he played a match for the British Davis Cup team in the first round against France in 1946.

After his active career, he took a job as a sportsjournalist at the Daily Telegraph and succeeded A. Wallis Myers as tennis correspondent.