Tensfelder Au (German pronunciation: [ˈtɛnt͡sˌfɛldɐ ˈaʊ̯] ⓘ) is a river of Schleswig-Holstein, Germany.

It springs north of the village of Blunk and then flows in a northeasterly direction through the town of Tensfeld and Hornsmühlen into the lake Großer Plöner See.

After the Schwentine, the Tensfelder Au is the second largest river flowing into the Großer Plöner See.

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