St Peter's School is a co-educational private boarding and day school, in the English City of York, with extensive grounds on the banks of the River Ouse. Founded by St Paulinus of York in AD 627, it is considered to be the third oldest school in the world although some historians take a more sceptical view. It is part of the York Boarding Schools Group.

Private schools in the United Kingdom are schools that require fees for admission and enrollment. Some have financial endowments, most are governed by a board of governors, and are owned by a mixture of corporations, trusts and private individuals. They are independent of many of the regulations and conditions that apply to state-funded schools. For example, the schools do not have to follow the National Curriculum, although many such schools do.