Pope Martin I (died 16 September 655) is the head of the Catholic Church from 21 July 649 to his death in 655.

He was born near Todi, Umbria, in the place now named after him (Pian di San Martino).

He succeeds Pope Theodore I on July 5, 649.

He is the only pope during the Byzantine Papacy whose election is not approved by a iussio from Constantinople.

Martin I is abducted by Emperor Constans II and dies in the Crimean peninsula.

He is considered a martyr by the Catholic Church.

He was the last apocrisiarius to be elected pope.