Almnäs Castle, 18th-century castle in Hjo Municipality, Sweden

Almnäs Castle is an 18th-century residence in Hjo Municipality, Västergötland, built in the Baroque style and positioned near a lake cove. The structure stands within an established park that surrounds the entire property and provides a landscaped setting for the building.

Almnäs was held by Alvastra Abbey in the Middle Ages. In 1592 Johan III exchanged it to Axel Johansson (Natt och Dag), who likely first built it as a manor. It later belonged to the Sparre, Bielke, Horn and Ehrensten families; Gustaf Sparre, speaker of the First Chamber, bought it in 1859 and sold it to Oscar Dickson.

Almnäs takes its name from the estate that belonged to Alvastra Abbey in the Middle Ages. In 1592 Johan III exchanged it to Axel Johansson (Natt och Dag), who probably first built it up as a manor. The name survives in Almnäs tegelbruk, the estate's brickworks, listed as a related site.

The castle is a private residence with no public access to its interior or grounds. It sits about 5 kilometers (3 miles) south of Hjo town and can be viewed from the surrounding area.

Gustaf Sparre, speaker of the First Chamber of the Swedish Riksdag, bought Almnäs in 1859 and then sold the estate to Oscar Dickson. The purchase came after the estate had passed through the Sparre, Bielke, Horn and Ehrensten families.