John Cosgrove (1867 – 11 August 1925) was an Australian actor, writer and director who worked in theatre and films during the silent era. He sometimes collaborated with Bland Holt.
Cosgrove had a turbulent personal life. He would borrow money so often he was nicknamed "The Great Australian Bite". His first daughter died when a few days old. Another daughter, Noel, died of tuberculosis at the age of nineteen. His son Bill died in a plane crash in 1943.