The Blob is a 1958 American independent science fiction horror film directed by Irvin Yeaworth and written by Kay Linaker and Theodore Simonson. It stars Steve McQueen (in his first leading role) and Aneta Corsaut and co-stars Earl Rowe and Olin Howland. It was distributed by Paramount Pictures as a double feature with I Married a Monster from Outer Space.

The film concerns a carnivorous amoeboidal alien that crashes to Earth from outer space inside a meteorite, landing near the small communities of Phoenixville and Downingtown, Pennsylvania. It envelops living beings, growing larger, becoming redder in color and more aggressive, eventually becoming larger than a building.