Burg Salzwedel, Medieval castle ruins in Salzwedel, Germany.

Burg Salzwedel is a ruined lowland castle in the Burggarten on the northern edge of Salzwedel's old town. Its circular site measures about 220 metres across and was once enclosed by moats and walls. Remains of the defensive wall, the castle moat and St. Anne's Chapel survive, along with a round keep 24 metres high whose walls are 3.6 metres thick at the base and whose entrance lies 12 metres above ground.

The castle was first mentioned in 1112 during a siege by Emperor Henry V and primarily served to protect a strategic river crossing. Over centuries it lost its military importance and gradually fell into ruins.

The site's name appears in a 1196 charter as "Saltuedel tam castra quam oppida", distinguishing the castle from the settlement beside it. The St. Anne's Chapel, the moat and wall remnants survive within the Burggarten, and a 1923 memorial hall on the grounds commemorates the dead of the First World War.

The grounds are accessible year-round and allow free exploration of the ruins outdoors. A nearby museum displays archaeological finds from the castle period.

The round tower has an unusually high entrance positioned several meters above ground, showing how castle dwellers protected themselves from intruders. This design was a typical security measure found in many medieval fortifications.