Jules Omer John Malfroy (4 December 1901 – 3 August 1973) was a prominent New Zealand lawyer, legal advisor to the British government during the Second World War, and an early twentieth century rugby union international.
He is known as one of the "lost lions" due to his participation on the 1927 British Lions tour to Argentina, which, although retrospectively recognised as a Lions tour, did not confer Test status on any of the four encounters with the Argentina national rugby union team.