Martin James Smith is an English vocalist, guitarist, songwriter, and producer, best known as the frontman of the Christian rock and worship band Delirious?. He has been a solo artist since Delirious?' disbandment in 2009.

Delirious? were an English contemporary Christian band. For the majority of their career, the lineup featured Martin Smith on vocals and guitar, Stu G on guitar and backing vocals, Jon Thatcher on bass guitar, Tim Jupp on keys and piano, and Stew Smith on drums and percussion. Paul Evans took over as drummer for the band's final two years.