"Movie fans across the United States are invited to microwave some popcorn and gather by the warm glow of the computer monitor to enjoy a complimentary showing of this timeless love story," Warner Brothers Digital Distribution said in a release.
The 1942 film, which won three Academy Awards including one for Best Picture, will be streamed at facebook.com/CasablancaTheMovie on May 16 starting at 7pm EST (9am AEST tomorrow) and again when 7pm arrives in California, (12pm AEST tomorrow).
The recently released anniversary edition priced at $65.40 boasts more than 14 hours of material including documentaries about Casablanca, the film's director, and Warner Brothers studio.
It is unclear whether Australians will be able to stream the film. Users that try to visit the page where the film will screen are met with a message saying the content is unavailable in this region.