Paul Maslansky, a producer behind films such as “Police Academy” and “Return to Oz,” died on Monday of natural causes at a hospital in Los Robles, Calif. He was 91.

Maslansky collaborated frequently with Oscar winner Alan Ladd Jr. Together they worked on “The Russia House,” “Death Line,” “Race With the Devil” and “Damnation Alley.” He also produced “Love Child” in 1982 as well as the 1979 comedy film “Scavenger Hunt” and the 1995 fantasy feature “Fluke,” starring Matthew Modine.

Following the production of “Love Child,” Ladd requested that Maslansky advise on The Ladd Co.’s upcoming movie “The Right Stuff.” After watching the parade scene in the film, Maslansky wrote a short story about a group of police cadets. This would go on to become “Police Academy,” which grossed $82 million in 1984 and led to six film sequels, an animated television show and a live-action series.

Prior to the film’s theatrical release, Maslansky...