Fotheringhay Castle, also known as Fotheringay Castle, was a High Middle Age Norman Motte-and-bailey castle in the village of Fotheringhay 3+1⁄2 miles (5.6 km) to the north of the market town of Oundle, Northamptonshire, England. It was probably founded around 1100 by Simon de Senlis, Earl of Northampton. In 1113, possession passed to Prince David of Scotland when he married Simon's widow. The castle then descended with the Scottish princes until the early 13th century, when it was confiscated by King John of England.

Oundle is a market town and civil parish on the left bank of the River Nene in North Northamptonshire, England, which had a population of 6,254 at the time of the 2021 census. It is 69 miles north of London and 12 mi (19 km) south-west of Peterborough. The town is home to Oundle School.