Warner Bros. Entertainment, Inc., also known as Warner Bros. Pictures or simply Warner Bros. (though the name was occasionally given in full form as Warner Brothers during the company's early years) is an American producer of film and television entertainment.

One of the major film studios, it is a subsidiary of Time Warner, with its headquarters in Burbank, California and New York, New York. Warner Bros. has several subsidiary companies, including Warner Bros. Studios, Warner Bros. Pictures, Warner Bros. Interactive Entertainment, Warner Bros. Television, Warner Bros. Animation, Warner Home Video, New Line Cinema, TheWB.com, and DC Comics. Warner owns half of The CW Television Network.

1903–25: Founding

The corporate name honors the four founding Warner brothers (born Wonskolaser)—Harry (born Hirsch), Albert (born Aaron), Sam (born Szmul), and Jack (born Jacob), whose parents had emigrated to North America from Poland, which was at that time part of the Russian Empire. The three elder brothers began in the movie theatre business, having acquired a movie projector with which they showed films in the mining towns of Pennsylvania and Ohio. They opened their first theater, the Cascade, in New Castle, Pennsylvania in 1903. (The site of the Cascade later became the Cascade Center, a shopping, dining and entertainment complex honoring its Warner Bros. heritage, though in late 2010 all of the businesses have closed and the complex is currently for sale.)

When this original theatre building in New Castle was in danger of being demolished, the modern Warner Bros. called the modern building owners, and arranged a 3 way even splitting of the cost of saving it, between the state, Warner Bros, and the modern owners. The owners noted the fact that they were taking phone calls from all over the country in reference to the historical significance of the humble building that should be saved historically.