Alte Feste, German colonial fort museum in Windhoek, Namibia

Alte Feste is a German colonial fort and museum in downtown Windhoek with four towers at its corners and an inner courtyard. The square-shaped building dates to the city's founding period and ranks among its oldest structures.

The fort was founded in 1890 by Captain Curt von François as headquarters for the German Schutztruppe. It marked the start of organized German settlement in Windhoek and European control over the region.

The fort is closed to visitors and its collections are in storage, so the courtyard is the only part still reachable. The Reiterdenkmal, the equestrian monument unveiled at the main entrance on 14 November 2010, was dismantled on 25 December 2013 and moved inside the fort. From 2024 the site is to become a Centre for Arts, Crafts and Heritage, run with the Namibia Craft Centre, alongside a National Museum of Genocide and Colonial History.

The Alte Feste has been closed since 1 July 2014; only the inner courtyard remained accessible as of January 2019. It stands on Robert Mugabe Avenue beside the Independence Memorial Museum. Renovation was announced in April 2024 at a cost of 30 million Namibian dollars, so access should be confirmed before setting out.

The building served as a school hostel for many years before becoming a museum. Despite its military origins, the site saw no combat throughout all its different uses.