William H. O'Brien
- Born
- 19 July 1891 (89 years old)
- Passed away
- 18 April 1981
- Place of birth
- Peak Hill, New South Wales, Australia
- Gender
- Male
Australian born William H. O'Brien began his screen acting career in Australia in 1918, then resumed in Hollywood in 1921. He continued acting in films and television series to 1971.
