Playscripts, opera libretti, publicity material, financial papers, correspondence, technical notes, agreements, contracts, scrapbooks, career files and photographs. Playscripts and libretti are the largest component (339 boxes). Among the many performers and companies documented are Oscar Asche, Jessie Matthews, Dame Nellie Melba, Anna Pavlova, Noel Coward, Marcel Marceau, Robert Helpmann, Rudolf Nureyev, Joan Sutherland, Australian Ballet, Borovansky Ballet. Italian Grand Opera Company and Old Vic Company. Most of the correspondence, financial business records date from 1950-1976, but there are some earlier agreements and contracts.
J.C. Williamson Ltd was for nearly a century the dominant theatrical agency in Australia, owning several theatres and bringing out to Australia a succession of notable actors, singers and dancers. It was founded by the actor-manager James C. Williamson (1845-1913) in 1882 and was finally bought out in 1984.