FernGully: The Last Rainforest is a 1992 animated musical fantasy film directed by Bill Kroyer in his feature directorial debut. Scripted by Jim Cox and adapted from the "FernGully" stories by Diana Young, the film is an Australian and American venture produced by Kroyer Films, Inc., Youngheart Productions, FAI Films, and distributed by 20th Century Fox. It stars the voices of Tim Curry, Samantha Mathis, Christian Slater, Jonathan Ward, Robin Williams, and Grace Zabriskie.

The film is set in an Australian rainforest inhabited by fairies, including Crysta, who accidentally shrinks a young logger named Zak to the size of a fairy. Together, they rally the fairies and the animals of the rainforest to protect their home from the loggers and Hexxus, a malevolent pollution entity. Wayne Young, the film's producer, said that the film was "blatantly environmental", although he made an effort to avoid "preaching".

FernGully was released in North America on April 10, 1992, to mainly positive reviews, and was generally considered a moderate financial success at both the box office and in home video sales. In 1998, it was followed by a direct-to-video sequel, FernGully 2: The Magical Rescue, although none of the original voice cast reprised their roles.