Pulverturm, Fortification powder tower in Oldenburg, Germany.

The Pulverturm is a circular brick tower with a domed roof standing at the northern edge of Schlossgarten and represents the last surviving defensive structure of the city. A small section of the original wall still connects to it, showing what the fortification system looked like.

The Großer Zwinger before the Eversten Gate was built in 1529 as a low gun platform over a vault; the conical-roofed tower above it probably dates from the early 17th century, first depicted with its roof in 1625. During the Danish fortification period (1730–1765) it served as the powder magazine of the Eversten Gate complex. After the fortress was abandoned in 1765 it was used as an ice cellar for nearby Schloss Oldenburg until about 1900.

Since 1988 the domed upper room has hosted cultural events and exhibitions of art and ceramics. The tower's name comes from its use as a powder magazine under Danish rule, and it later served the nearby Schloss as an ice cellar until around 1900.

The tower sits within the Schlossgarten and can be reached on foot as part of a walk through the grounds, especially when visiting the palace or nearby parks. A simple stroll through the gardens naturally brings you past the structure alongside other historic buildings.

The tower leans toward the Schlosswall: leveling layers in the masonry show the tilt appeared during or shortly after construction. Settlement checks in recent years have recorded no further leaning. Excavations of the foundations took place in 1992 and were extended in 1993 by the Institute for Monument Protection from Hanover with the city of Oldenburg.