Hollywood Black Friday is the name given, in the history of organized labor in the United States, to October 5, 1945. This day, a six-month strike by the set decorators represented by the Conference of Studio Unions (CSU) boiled over into a bloody riot at the gates of Warner Brothers' studios in Burbank, California.

The strikes helped the passage of the Taft-Hartley Act in 1947 and led to the eventual break-up of the CSU and reorganization of the then rival International Alliance of Theatrical Stage Employees (IATSE) leadership.

After 9 months of wage negotiations and most of the studios reaching a deal, Warner Brothers failed to deal with the newly formed union, setting off a strike that delayed films such as Dual in the Sun and Night and Day.

Approximately 10,500 employees picketed the gates of the studio. When workers attempted to break the line and fill the jobs, cars were attacked and overturned, forcing the hand of Burbank police to take action against the picketers. Over 40 injuries were reported.