What was the name of the fictional film studio in the 1952 musical Singin' in the Rain?

The fictional film studio in the 1952 musical Singin' in the Rain is Monumental Pictures.

The studio is introduced during the film’s opening story, which is set in Hollywood in 1927. Silent-film stars Don Lockwood and Lina Lamont are presented as Monumental Pictures performers, with their films and publicity managed by studio head R. F. Simpson.

Monumental Pictures is fictional, created for the movie’s playful portrait of Hollywood’s transition from silent films to talking pictures. It should not be confused with Metro-Goldwyn-Mayer, the real studio that produced Singin' in the Rain. MGM’s famous roaring-lion logo appears on the actual film, while Monumental Pictures exists inside the story.

The fictional studio gives the plot a believable workplace: its sound stages, executives, publicity department, diction lessons, and film productions all become part of the comedy surrounding Lina’s struggle with sound recording. The story’s central movie, The Dueling Cavalier, is eventually transformed into a musical after the arrival of talkies.