Burtnieki Castle (German: Burg Burtneck; Estonian: Asti ordulinnus) is a castle in Burtnieki Parish, Valmiera Municipality in the Vidzeme region of Latvia. It was built on the south shore of Lake Burtnieks for the Livonian Order around 1284.

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• List of castles in Latvia

Zarāns, Alberts (2006). Latvijas pilis un muižas. Castles and manors of Latvia (in Latvian and English). Riga. ISBN 9984-785-05-X. OCLC 72358861.{{cite book}}: CS1 maint: location missing publisher (link)

• Media related to Burtnieki Castle ruins at Wikimedia Commons
• Burtnieki Castle (in Latvian)

57°41′55″N 25°16′43″E / 57.6985°N 25.2787°E / 57.6985; 25.2787