"Mr. Brightside" is a song by American rock band The Killers. It was released as the band's debut single in the industry and is featured on their debut studio album Hot Fuss (2004). Written by band members Brandon Flowers and Dave Keuning, the song was originally released on September 29, 2003 and achieved minor success. It became more popular upon its re-release in 2004, peaking at number 10 in both the United States and the United Kingdom.