Burgruine Heinrichsbürg, Medieval castle ruins in Neumarkt in der Oberpfalz, Germany.

Burgruine Heinrichsburg is a castle ruin on elevated terrain in Neumarkt in der Oberpfalz, with stone walls and foundations still visible. The remaining structures demonstrate typical medieval construction methods and the strategic defensive design of the fortress.

Heinrichsbürg Castle was built in the 12th century and passed to the Palatinate in 1329 under the House Treaty of Pavia. From 1345 to 1366 it was held in fief by Albrecht IV von Thann; in 1366 Heinrich VI von Wildenstein bought it and sold it on 13 May 1369 for 1200 pounds of Heller to Heinrich IV von Stein auf Hiltpoltstein. In the 15th century Count Palatine Johann enlarged it into a hunting lodge, and in 1504 it was destroyed in the Landshut War of Succession.

The castle's several names—Heinrichsbürg, Heinzburg, Hainsburg, Heinsberg—survive in local usage and records. In the 15th century Pfalzgraf Johann converted it into a hunting lodge, so the site served the Palatinate court as a base for hunting in the woods around the Schlossberg before its destruction in 1504.

The site is accessible via marked hiking trails that connect to other historical locations in the region. Comfortable footwear and planning for uneven terrain are recommended for visitors.

The ruin sits on a steep, seven-metre-high cone-shaped mound, and around it survive the remains of a circular rampart and ditch system. The whole site is recorded as a medieval castle site (Burgstall) under the number D-3-6734-0004 in the Bavarian monument atlas.