Alligator is a 1980 comedy horror film, directed by Lewis Teague with a screenplay by John Sayles. It stars Robert Forster, Robin Riker and Michael V. Gazzo.

The film follows the attempts of a police officer David Madison and a reptile expert, Marisa Kendall to stop a deadly alligator which is killing humans in the sewers of Chicago.

The film received praise from critics for its intentional humour and in 1991, an apparent sequel was released entitled Alligator II: The Mutation. Despite the title this film shared no characters or actors with the original, and the plot was essentially a retread of the first film.

Ramon the alligator is flushed down the toilet as a baby and grows into a gargantuan monster by eating the corpses of laboratory animals who have undergone dubious hormone experiments, thus providing all the ecological and social subtext that one could possibly wish for, even if one doesn't normally go for films about giant alligators eating people left, right, and center--which is the inevitable and tragic result of Ramon's decision that the outside world looks rather more interesting than the sewers.... Written by Michael Brooke