" Lonely Day" is a song by American heavy metal band System of a Down. It was released on April 17, 2006, as the second single from their fifth studio album, Hypnotize (2005), making it their last single before their hiatus and their most recent single until 2020 with "Protect the Land" and "Genocidal Humanoidz" being released as double A-side singles. Written by guitarist Daron Malakian, who also provides lead vocals, the song also received a nomination for Best Hard Rock Performance at the 49th Annual Grammy Awards.Blabbermouth.net. "SLAYER, LAMB OF GOD, STONE SOUR Among GRAMMY Nominees", December 7, 2006, at Blabbermouth.net ; last accessed December 7, 2006.
| +Weekly chart performance for "Lonely Day" ! scope="col" | Chart (2006) ! scope="col" | Peak position |
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