Gaujiena (German: Adsel) is a village along the Gauja River in Gaujiena Parish, Smiltene Municipality, Latvia. It was the seat of a Komtur of the Teutonic Knights. The Gaujiena Castle was erected in the 13th century, but fell into disrepair in the 18th century.

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  Gaujiena Palace
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  Gaujiena Castle ruins
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• Krahe, Friedrich-Wilhelm (2000). Burgen des deutschen Mittelalters. Grundriss-Lexikon (in German). Flechsig. p. 692. ISBN 3-88189-360-1.