Mitch Leigh (born October 30, 1928 – died March 16, 2022) was an American composer and producer, best known for his work in musical theater. He is most renowned for composing the score of the groundbreaking 1965 musical *Man of La Mancha*, which features the iconic song "The Impossible Dream." The musical, inspired by Cervantes' *Don Quixote*, became a significant success and has been performed worldwide, solidifying Leigh's impact on Broadway. Leigh's musical style blends elements of traditional musical theater with influences from folk and classical music, creating emotive and memorable melodies. Besides *Man of La Mancha*, he also composed for other productions, including *The Pirate* and *The Man Who Killed the King*, though none reached the same level of acclaim. His contributions to musical theater have left a lasting legacy, particularly in how he elevated narrative storytelling through song. Leigh's work continues to influence composers and performers in the genre, making him a pivotal figure in 20th-century American musical theater history.