Fotheringhay Castle, Medieval castle ruins in Fotheringhay, England.

Fotheringhay Castle is a medieval fortress in Fotheringhay, England, where earthen mounds and stone fragments mark the footprint of what once stood here. The raised central mound rises above the flat river meadows, enclosed by deep dry ditches that once formed the outer defensive ring.

Simon de Senlis, Earl of Northampton, probably founded the castle around 1100; it passed to Prince David of Scotland in 1113 and was confiscated by King John in the early 13th century. Richard III was born here in 1452, and Mary, Queen of Scots was tried and executed in the castle in 1587. It was dismantled in the 1630s, leaving only earthworks.

Mary, Queen of Scots was beheaded in the castle's Great Hall on 18 February 1587. In the nearby Church of St Mary and All Saints are tombs and memorials to the House of York, including Edward, Duke of York (d. 1415) and Richard, Duke of York (d. 1460); a side chapel holds a memorial to Richard III, whose remains were found in Leicester in 2012.

A public footpath leads from St Mary and All Saints Church through the meadows to the ruins, which are freely accessible at any time. The grass path can become muddy after rain, so sturdy footwear is recommended for the short walk.

Mary, Queen of Scots was beheaded in the castle's Great Hall on 18 February 1587. The claim that James I had the castle demolished in 1627 in revenge is wrong: it was probably abandoned because it was no longer profitable, and by about 1635 it was reported ruinous, with demolition following soon after.