Lostprophets are a Welsh rock band from Pontypridd, formed in 1997. Founded by vocalist Ian Watkins, bassist (later guitarist) Mike Lewis, drummer Mike Chiplin and guitarist Lee Gaze, they were originally a side-project to hardcore punk band Public Disturbance. Since their formation, Lostprophets have released four studio albums and three EPs, most recently releasing The Betrayed on 13 January 2010, and are part of the Cardiff music scene.

The band have achieved two top ten hits on the UK Singles Chart ("Last Train Home" and "Rooftops"), one number one single on the Alternative Songs chart ("Last Train Home"), and several Kerrang! Awards and nominations.