Sandal Castle is a ruined medieval castle in Sandal Magna, a suburb of the city of Wakefield in West Yorkshire, England, overlooking the River Calder. It was the site of royal intrigue and the setting for a scene in one of William Shakespeare's plays.

Sandal Magna or Sandal is a suburb of Wakefield, West Yorkshire, England with a population in 2001 of 5,432. An ancient settlement, it is the site of Sandal Castle and is mentioned in the Domesday Book. It is 2 mi (3.2 km) south from Wakefield, 8 mi (13 km) north of Barnsley. The Battle of Wakefield was fought here in the 15th century during the Wars of the Roses.