Mest is an American rock band originally formed by lead vocalist and guitarist Tony Lovato, bassist Matt Lovato, drummer Nick Gigler, and guitarist Jeremiah Rangel. They broke up in 2006 after eleven years, but temporarily reformed in California in 2008 for a "final tour." Tony released “Not What You Expected” in 2013 and it was announced in 2018 that the classic lineup of Mest, with Tony Lovato, Matt Lovato, Nick Gigler, and Jeremiah Rangel, would be getting back together to track Masquerade.

Cousins Matt Lovato and Tony Lovato formed the band together in October 1995. The band's last guitarist, Jeremiah Rangel, joined the band in 1998. Their previous guitarist was Steve Lovato, Tony Lovato's brother. Nick Gigler joined the band in 1997.

In 1998, the band self-released Mo' Money, Mo' 40z. Their debut album on Maverick Records, Wasting Time, was released in July 2000 and Destination Unknown in 2001. They toured as an opening band for Goldfinger on July 20, 2002, in Las Vegas and then a few months later, released a DVD called The Show Must Go Off! in January 2003. Later that same year, the band released their self-titled album, which featured the single Jaded (These Years), featuring Benji Madden of Good Charlotte.

In 2005, a tour with Social Distortion was cut short when drummer Nick Gigler required surgery for carpal tunnel syndrome in his wrists which was affecting his drumming. The band's last album, Photographs, was released October 18, 2005.

In January 2006, the band announced on their MySpace blog that they would break-up following a U.S. tour. The tour ran from late January until early March, with support from Allister and Scary Kids Scaring Kids.

Mest played a reunion show at the House of Blues in Anaheim, California, on April 17, 2008. In response, Nick Gigler posted a bulletin through his personal MySpace and confirmed that he would not be taking part, and that he had called Jeremiah Rangel and Matt Lovato, who had confirmed that they would not be appearing with Tony either.

After the one-off "One Night Stand" show, Tony decided to rebuild Mest and go on a monthlong tour, with help from Chris Wilson (Good Charlotte, The Summer Obsession), and his brother and founding member, Steve Lovato (at the time in Room One Eleven). Although Matt showed interest, he and Jeremiah were both reported to be too busy with other commitments to join. Nick and Tony had not been on speaking terms since the band broke up. The trek took place in October and November 2008, and featured Quietdrive, Rookie of the Year, and Automatic Loveletter.

Mest went on a European tour in spring 2012 with its current members, Mike Longworth and Richie Gonzales, and also toured the US with Escape the Fate and Attack Attack in 2012.