Penelope Spheeris is an American film director, producer, and screenwriter. She has directed both documentary and scripted films. Her best-known works include the trilogy titled The Decline of Western Civilization, each covering an aspect of Los Angeles underground culture, and Wayne's World, her highest-grossing film.

The Decline of Western Civilization is a 1981 American documentary filmed through 1979 and 1980. The movie is about the Los Angeles punk rock scene and was directed by Penelope Spheeris. In 1981, the LAPD Chief of Police Daryl Gates wrote a letter demanding the film not be shown again in the city.