The Secret of NIMH (alternatively spelle "The Secret of N.I.M.H.") is a 1982 animated film adaptation of the Newbery Medal-winning book Mrs. Frisby and the Rats of NIMH (Mrs. Frisby's name is changed to "Brisby" in the film due to trademark concerns with Frisbee discs), written by American author Robert C. O'Brien. The title of the movie was later used for newer editions of the book. It was directed by Don Bluth, produced by Aurora Pictures, and released by United Artists.