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 when placing a caller on hold Opus 1 (Opus album), 1975 Opus 1 (After Crying album), 2009 Opus One Winery, United States An alternative title for the 1971 demo versions of Mike Oldfield's 1973 album, Tubular Bells
See also Op. 1 (disambiguation), musical compositions assigned number 1 Opus number, numbers assigned to musical compositions