Lidgate Castle is a medieval motte and bailey castle in the village of Lidgate, Suffolk, England, built to an unusual quadrangular design.

[1] At this time King Stephen of England was engaged in a campaign against the rebel baron Geoffrey de Mandeville, and the castle may have been built as part of the campaign to contain his advances in the region.

[2] The castle was built on a natural rise, and takes the form of an unusual, quadrangular motte and bailey design.

[3] The castle was probably abandoned in the 1260s, and at some point in the 13th or 14th century, St Mary's Church was built inside the bailey, against the earthworks.

The church's nave was probably the original castle chapel – the south side of the castle was largely destroyed to make way for the growth of the village and agriculture.