"Classical Gas" is an instrumental musical piece composed and originally performed by Mason Williams with instrumental backing by members of the Wrecking Crew. Originally released in 1968 on the album The Mason Williams Phonograph Record, it has been re-recorded and re-released numerous times since by Williams. One later version served as the title track of a 1987 album by Williams and the band Mannheim Steamroller.

Originally named "Classical Gasoline", the song was envisioned to be "fuel" for the classical guitar repertoire. The title was later shortened by a music copyist.

Williams was the head writer for The Smothers Brothers Comedy Hour at the time of the piece's release and premiered the composition on the show. Williams performed it several times over several episodes. After the piece had reached the Top Ten, Williams asked an experimental filmmaker named Dan McLaughlin to adjust a student video montage that he had created of classical art works using Beethoven's 5th Symphony and edit it in time to "Classical Gas", using the visual effect now known as . The work, 3000 Years of Art, premiered in 1968 on the Smothers Brothers. The song peaked at number 2 for two weeks in August that year. On the US Easy Listening chart it went to number one for three weeks.

There is a common misconception that "Classical Gas" was composed and originally performed by Eric Clapton. Clapton has never recorded a cover of the song. This misconception may be due to the fact that Clapton was musical director of, and played much of the guitar music for, the feature film The Story of Us. The version of the song on the film's soundtrack is actually Williams' own solo-guitar re-recording of it, from his 1970 album Handmade.

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