John Reford Ewart (26 February 1928 – 8 March 1994) was an Australian actor of radio, stage, television and film.
Ewart began his acting career when he was cast as Dopey at the age four in a 3XY radio production of Snow White.
At the age of 18, he made his film debut in the lead role of Mickey O'Riordan in Charles Chauvel's production of Sons of Matthew.
To many thousands of Australians who grew up in the 1950s and '60s, he will be remembered as 'Jimmy', the boyishly cheeky co-presenter of the ABC Radio Children's Session, and in the title role of its long-running serial The Muddle-Headed Wombat.
Ewart married four times, firstly to Lorraine Marie Croke, a Sydney beauty consultant in May 1951 and had twins, a son and a daughter, but divorced a few years later, he then married Susan Mary Newton, a classical singer and actress on radio, stage and TV on 17 April 1966, with whom he had two daughters.