The Blob is an independently made 1958 American horror/science-fiction film that depicts a giant amoeba-like alien that terrorizes the small community of Phoenixville, Pennsylvania. In the style of American International Pictures, Paramount Pictures released the film as a double feature with I Married a Monster from Outer Space. There is a sequel and a remake but "the blob" is the original created in 1958.

The film was Steve McQueen's debut leading role, and also starred Aneta Corsaut. The film's tongue-in-cheek theme song, "Beware of the Blob", was written by Burt Bacharach and Mack David and became a nationwide hit in the U.S. It was recorded by studio group the Five Blobs—actually singer Bernie Nee overdubbing himself.