Niederösterreichische Landesbibliothek, State library and museum in St. Pölten, Austria

The Niederösterreichische Landesbibliothek is a library and museum located at Landhausplatz in St. Pölten holding extensive materials on regional history. The collection includes books, historical maps, photographs, drawings, and other items housed in reading rooms and exhibition spaces open to visitors.

Founded in 1813, the library was housed in the former Lower Austrian Landhaus (today Palais Niederösterreich) in Vienna until 1967, then in a building on Teinfaltstraße until 1996. It has borne the title Landesbibliothek since 1861. In 1997 it moved into its own new building in the St. Pölten government quarter, designed by Paul Katzberger with execution by architect Karin Bily.

The library serves as a meeting place for readers and literature enthusiasts exploring historical and contemporary works from the region. Regular readings and exhibitions here center on local authors and cultural topics that matter to the community.

Visitors can work with materials in the reading rooms and should check beforehand whether special collections are accessible or registration is required. The location is central in St. Pölten and easily reached on foot, though allow adequate time when exploring larger collections.

The library holds around 100,000 historical views of towns and buildings, alongside some 20,000 maps. These pictures and plans document how places in Lower Austria looked before later rebuilding, and they sit in a separate topographical collection around the reading room on the upper floor.