Beaufort Castle or Castle Dounie (Scottish Gaelic: Caisteal Dhùnaidh) is a Baronial style mansion built in 1880 and incorporating older building work. It is situated on the right bank of the River Beauly near the town of Beauly in Inverness-shire and is 1 mile (1.6 km) north of Kiltarlity and 13 mi (21 km) west of Inverness. There has been a castle on the site since the 12th century. Beaufort is the traditional seat of the Lords Lovat.
The earliest mention of the site, as Downie or Dounie Castle, occurs in the reign of Alexander I (1106–1124), when a siege took place. The original castle was built by the Byset family. The castle came into the hands of the Frasers in the late 13th century. English forces besieged the castle in 1303.