Lengenfeld is a town in the district of Krems-Land, in the Austrian state of Lower Austria. It lies in the Waldviertel, the northwestern quarter of Lower Austria, a region of rolling granite highlands and forested countryside north of the Danube.
The municipality is one of the communities that make up the Krems-Land district, whose administrative seat is the city of Krems an der Donau. Like other towns in the Waldviertel, it is a small, rural settlement rather than an urban centre.