On Through the Night is the debut album by English rock band Def Leppard, released in 1980. It charted at #51 on the Billboard 200 and #15 on the UK Albums Chart. The album features re-recorded versions of "Rocks Off" and "Overture", tracks from the band's original independently released EP, The Def Leppard E.P. Other tracks are rerecorded versions of early demos, some of which appeared on the First Strike and Warchild bootlegs. The album was certified platinum by the RIAA on 9 May 1989.
"Wasted", "Rock Brigade" (b/w "When the Walls Came Tumbling Down") and "Hello America" were released as singles. However, the version of "Wasted" that appears on the single is a different recording from that of the LP, as is its B-side, "Hello America". The album was produced by Tom Allom.