"When You Were Young" is a song by American rock band The Killers. It was released on September 18, 2006 as the lead single from their second studio album, Sam's Town (2006). The song was written and produced by The Killers and co-produced by Flood and Alan Moulder.

The song has proven to be one of The Killers' most successful singles, peaking at number 14 on the Billboard Hot 100, as well as their only number one to date on the U.S. Modern Rock Tracks chart. Only "Mr. Brightside" and "Somebody Told Me" would stay longer on the chart and have more pop airplay. It is also their highest-charting single to date in the United Kingdom and Australia, peaking at number two and number 10 respectively.

The song, which is in the key of B major and written in common time, displays the band's move towards a more "heartland rock" style, as it is part of an album that was supposedly heavily influenced by the music of Bruce Springsteen. The song itself was reportedly influenced by Springsteen's "Born to Run" and "Thunder Road". The song was nominated for the Grammy Award for Best Rock Song, and the single's video, directed by Anthony Mandler, received a nomination in the category of Best Short Form Music Video. The single was ranked number 69 on iTunes Top 100 Best Sellers: Songs of 2006. The song also made number 4 on the Triple J Hottest 100, 2006.

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