Lesmoir Castle was a 16th-century castle, about 2.0 miles (3.2 km) west of Rhynie, Aberdeenshire, Scotland, south-west of Tap o' Noth, at Mains of Lesmoir.

David Leslie captured it in 1647 by draining the wet moat; he sacked the castle and hanged 27[2] of the garrison.

[2][1] In 1647 there was a tower with a walled courtyard, which enclosed outbuildings.

A house here remained until 1759 when it was demolished for building materials.

The bailey which was to the south was a triangle about 5 feet (1.5 m) above the marshland.