Martin Lancelot Barre is an English guitarist best known for his longtime role as lead guitarist of British rock band Jethro Tull, with whom he recorded and toured from 1968 until the band's initial dissolution in 2011. Barre played on all of Jethro Tull's studio albums from their 1969 album Stand Up to their 2003 album The Jethro Tull Christmas Album. In the early 1990s he began a solo career, and he has recorded several albums as well as touring with his own live band.
He has also played the flute and other instruments such as the mandolin, both on stage for Jethro Tull and in his own solo work.