James Cassius Williamson (August 26, 1845 – July 6, 1913) was an American actor and later Australia's foremost theatrical manager, founding J. C. Williamson Ltd.
Born in Pennsylvania, Williamson moved with his family to Milwaukee, Wisconsin. His father died when he was eleven years old. He acted in amateur theatricals and joined a local theatre company as a call-boy at the age of 15, soon taking roles and eventually moving to New York where he played for several years at Wallack's Theatre and then other New York theatres. In 1871, he became the leading comedian at the California Theatre in San Francisco and the next year married comedienne Maggie Moore.
The two found success touring in Australia, and then playing in London, the U.S. and elsewhere in a comedy called Struck Oil. In 1879, Williamson obtained the right to present H.M.S. Pinafore and then other Gilbert and Sullivan operas in Australia. He soon formed his Royal Comic Opera Company. In 1881, Williamson became the lessee of the Theatre Royal, and the next year he entered into a partnership with Arthur Garner and George Musgrove, expanding to own more theatres and bringing famous actors to Australia, such as Sarah Bernhardt, H. B. Irving and (Dame) Nellie Melba, and becoming known for spectacular, large-scale productions.
The JC Williamson Award (formally known as the James Cassius Williamson Award), in honour of actor and theatre manager James Cassius Williamson, is a lifetime achievement award presented by Live Performance Australia (LPA) since 1998 in recognition of "individuals who have made an outstanding contribution to the Australian live entertainment and performing arts industry and shaped the future of our industry for the better", and is the highest honour the LPA can bestow. Recipients, who are performers, administrators, entrepreneurs, members of the media, writers, directors or politicians, are chosen by the JC Williamson Award Committee.
The inaugural recipients of the award were Edna Edgley and Kenn Brodziak. The most recent recipient is Australian theatre producer John Frost.