Olga Agnew (1899 – 18 August 1987) was an Australian child actress, who starred in multiple plays and one movie from 1912 to 1920. Agnew performed predominantly in shows directed by Beaumont Smith, including the theatrical adaption of Seven Little Australians (1914–15) and the silent film Our Friends, the Hayseeds (1917), and other productions such as The Sign of the Cross (1916–19), The Silence of Dean Maitland (1918) and Oliver Twist (1920). By 1917 Agnew had become one of Australia's biggest child actors, and at this time was also doing shows in New Zealand.