Steuerwald Castle, Medieval castle in Hildesheim, Germany.

Steuerwald Castle is a moated castle begun in 1310–1313 on the Innerste north of Hildesheim. Its 26-metre keep, built in 1325, has 2-metre-thick walls and a tent roof; the sandstone palace retains its west and north wings, with a 23.15-metre ridge height. Two sections of the outer ring moat survive to the south and west, and a 14th-century sandstone barn stands in the 175 × 175-metre inner court.

Bishop Henry II of Woldenberg had Steuerwald Castle built between 1310 and 1313 as a fortress against the citizens of Hildesheim, and it served as the bishops' de facto residence until 1573. In 1472/73 the city besieged it successfully, and it was often contested during the Hildesheim Diocesan Feud of 1519–1523. On 4 June 1632 Lüneburg troops took it by storm and damaged it considerably, after which the fortifications were dismantled.

The castle has housed the Hildesheim riding and driving club since 1973, when a racecourse was laid out behind it. St. Magdalena's Chapel, built in 1310 and remodelled in Gothic style in 1507, seats 55 people and is used for concerts and weddings. Above its pointed-arch entrance a sandstone relief shows the coat of arms of Bishop John IV, who ordered the remodelling.

The castle is not open to the public and is used by a private riding club. Visitors can view the exterior from the surrounding paths, including the 26-metre keep and the moat remains. The site is about 3 km north of Hildesheim's centre, reachable via Mastbergstrasse off the B6.

On 9 October 1943 a bomb exploded at the castle during an air raid on Hanover, killing four people; it was the first bomb to fall on Hildesheim. A photo hung in St. Magdalena's Chapel shows damage to the roofs of the palace, stables and large barn, while the chapel and the 26 m keep stayed intact.