Plymouth Marjon University, commonly referred to as Marjon, is the trading name of the University of St Mark and St John, a university based primarily on a single campus on the northern edge of Plymouth, Devon, United Kingdom. Formerly named University College Plymouth St Mark & St John, the institution was awarded full university status in 2013.

Plymouth is a port city and unitary authority in Devon, South West England. It is located on Devon's south coast between the rivers Plym and Tamar, about 36 miles (58 km) southwest of Exeter and 193 miles (311 km) southwest of London. It is the most populous city south of London.