埃恩施特布伦（德语：Ernstbrunn）是奥地利下奥地利州科尔新堡县的一个市镇。总面积80.69平方公里，总人口3008人，人口密度37.3人/平方公里（2005年）。

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Ernstbrunn is a town in the district of Korneuburg in Lower Austria in Austria. Ernstbrunn takes up about 80.69 square kilometers, 26.99 percent of which is forest.

The castle became the seat of the Ernstbrunn branch of the Counts of Sinzendorf in 1592. After the last Sinzendorf died in 1822, it was inherited by the Köstritz branch of the ruling princely House of Reuss of whom it remains their main family seat until today.