Marton — officially Marton-in-Cleveland — is a dormitory suburb of Middlesbrough, in north-east England, built from the 1950s onwards, around and beyond a small village of the same name. Marton now stands firmly within the boundaries of Middlesbrough unitary authority which is included in North Yorkshire for ceremonial purposes. Originally, the parish of Marton extended down to the River Tees; but, with the expansion of Middlesbrough, the parish became progressively smaller.