Opus One

Opus One may refer to:


 * "Opus No. 1", a tune by Sy Oliver and Sid Garris
 * "Opus Number One", a composition known for its use as music on hold
 * Opus 1 (album), by Yugoslav progressive rock band Opus
 * Opus One Winery, United States
 * An alternative title for the 1971 demo versions of Mike Oldfield's 1973 album, Tubular Bells