The day celebrates the snack of choice for movie watchers.
So whether your favourite's salted, sweet, buttered or toffee, here are 10 film tracks to help get you in the mood for this day of popcorn appreciation.
Lust for Life
This track appeared on the soundtrack for Trainspotting and is about Iggy Pop's lifestyle as a hard-living heroin addict. The song was co-written by David Bowie, with Bowie composing the music on ukulele.
The Imperial March
Known as the Imperial Death March, this was composed by Williams for Star Wars Episode V: The Empire Strikes Back. It was premiered three weeks before the film at Williams's first official concert as conductor-in-residence of the Boston Pops Orchestra.
My Heart will go on
This is the main theme for James Cameron's 1997 blockbuster Titanic. It was written by James Horner with lyrics by Will Jennings and went to No 1 in countries including the UK and US.
Released in 1985, this track appeared in Ferris Bueller's Day Off. However, its iconic start has been used in a number of movies, including American Pie, and is the theme for Duffman in the Simpsons.
Gonna Fly Now
Appearing on the Rocky soundtrack, this track was nominated for an Academy Award for Best Original Song. Carol Conners came up with the lyrics for the song while taking a shower.
Hip to be Square
Huey Lewis and the News
Written by Bill Gibson, Sean Hopper and Huey Lewis, this track featured in American Psycho. The song's outro was sung by members of the San Francisco 49ers football team.
(Everything I Do) I Do it for You
Appearing on the soundtrack from Robin Hood: Prince of Thieves, this track spent 16 consecutive weeks at the top of the UK charts, seven weeks at No 1 in the US and nine weeks in Canada.
Girl, You'll Be a Woman Soon
Written by Neil Diamond, this track featured on the Pulp Fiction soundtrack. Urge Overkill's Eddie "King" Roeser said: "We did our version from memory. It speeds up, the fills are all over the place, it's out of tune."
Chariots of Fire
Written and recorded by Vangelis, this track appeared in Chariots of Fire. The piece was originally called Titles because it's used in the film's opening sequence.
This track appeared on the Top Gun soundtrack. Bryan Adams was originally approached to record the song but refused because he felt the film glorified war and did not want his work linked to it.