Bill Bain (18 December 1929 in Wauchope, New South Wales, Australia – 22 February 1982) was an Australian television and film director. He directed numerous episodes of British television series, including Emerald Soup, The Avengers, Redcap, and Armchair Theatre. He won an Emmy Award in 1975 for Outstanding Directing in a Drama Series for his work on the Upstairs, Downstairs episode "The Sudden Storm".
In 1968 he married the British actress Rosemary Frankau and they had two sons Matthew and Sam Bain.