Thirty Seconds to Mars (commonly stylized as 30 Seconds to Mars) is an American rock band from Los Angeles, California, formed in 1998. The band consists of Jared Leto (lead vocals, guitar, bass, keyboards), Shannon Leto (drums, percussion) and Tomo Miličević (lead guitar, bass, strings, keyboards, other instruments).

The band's debut album, 30 Seconds to Mars (2002), was produced by Bob Ezrin and released to critical acclaim but only to limited commercial success. The band achieved worldwide fame with the release of their second album A Beautiful Lie (2005), which received multiple certifications all over the world, including platinum in the United States. Their next release, This Is War (2009), reached the top ten of several national album charts and earned numerous music awards. In 2013, Thirty Seconds to Mars moved to Universal Music and released the fourth album, Love, Lust, Faith and Dreams (2013), to critical and commercial success. As of May 2013, the band has sold over 10 million albums worldwide.