Leslie Iwerks (/ˈaɪwɜːrks/ EYE-wurks; born April 22, 1970) is an American film producer, director, and screenwriter. She has directed numerous documentary films and streaming series, including the Academy Award-nominated Recycled Life, and the Emmy Award-nominated documentaries The Pixar Story and The Imagineering Story. In 2026 she released Disneyland Handcrafted, a documentary about the creation of Disneyland.

Leslie Iwerk’s father Don Iwerks and grandfather Ub Iwerks were both Disney Legends. Ub Iwerks was the animator and co-creator of Mickey Mouse and Oswald the Lucky Rabbit. Leslie Iwerks graduated with a Bachelor of Arts from the University of Southern California.

In 1999, Walt Disney Pictures released her first feature-length documentary, The Hand Behind the Mouse: The Ub Iwerks Story, chronicling the life of her grandfather, Ub Iwerks. The film was narrated by Kelsey Grammer.

In 2000, Iwerks began working on ethnographic documentaries in Guatemala which resulted in the film Recycled Life (2006), which was nominated for the Academy Award for Best Documentary Short Film. The film documented the lives of Guatemalans who live and work in the largest landfill in Central America. The film was narrated by Edward James Olmos. Recycled Life raised an estimated $3 million for Safe Passage, a non-profit organization building schools for children who work in the dump.

The Pixar Story (2007), about the rise of Pixar Animation Studios was nominated for a Primetime Emmy Award in the Outstanding Nonfiction Special category and was additionally nominated for the A.C.E. Eddie Awards for Best Edited Documentary. The feature-length documentary was narrated by Stacy Keach and includes interviews with John Lasseter, Steve Jobs, Ed Catmull, George Lucas, Tom Hanks, and other producers, directors, and artists. Variety wrote, "The movie is, above all else, a celebration of animation in all its forms. Iwerks naturally has a firm grasp of the medium’s history and rightly sees Pixar as the catalyst for the recent resurgence of audience interest in animation."

Iwerks' 2008 short documentary Downstream is about the environmental effects of oil sands production in Alberta, Canada, as well as rare cancers being found downstream in the aboriginal community of Fort Chipewyan. Because the film scrutinized the local government's pro-oil policies and was partially subsidized by the Alberta Film Fund, it prompted Alberta's Minister of Culture, Lindsay Blackett, to criticize the film, which in turn, led to controversy about whether films subsidized by the government should be allowed freedom of artistic expression.

Iwerks released Industrial Light & Magic: Creating the Impossible (2010), which chronicles the developments of visual effects house Industrial Light & Magic from the earliest days of Star Wars to Star Trek Beyond. The documentary is narrated by Tom Cruise and features interviews with George Lucas, Steven Spielberg, Ron Howard, Robin Williams, J. J. Abrams, Jerry Bruckheimer, Samuel L. Jackson, Seth Green, Jon Favreau, and various ILM visual effects supervisors.

In 2011, the Biografilm Festival in Bologna, Italy, paid tribute to Iwerks through a multi-day retrospective of her documentary films.