1,039/Smoothed Out Slappy Hours is a collection of early recordings by the American punk rock band Green Day. It was released on July 1, 1991 through Lookout! Records.
Green Day's first compilation album, 1,039/Smoothed Out Slappy Hours is comprised of the band's debut album, 39/Smooth and two EP's, 1,000 Hours and Slappy. It also features the track I Want to Be Alone from The Big One compilation. However, the track is omitted from 2009 reissues of the album.
It is often mistaken as Green Day's debut album because of the identical cover art, excluding the name, the similar title and because the album itself sold more copies than the band's actual debut.
The album was re-released by Epitaph Europe in Europe and has since remained in print. It was re-released on CD on January 9, 2007 through the band's new label, Reprise Records. It was reissued on vinyl on March 24, 2009 in a package the contains the band's debut, 39/Smooth and reissues of 1,000 Hours and Slappy.
1,039/Smoothed Out Slappy Hours was certified gold in the United States by Recording Industry Association of America (RIAA) on June 28, 1995. The album has sold 632,000 copies as of August 2010. The album was certified gold in the United Kingdom on July 22, 2013.