The Holter Burg is the oldest castle site in the municipality of Bissendorf near Osnabrück in the German state of Lower Saxony.

The castle was probably initially destroyed as early as 1147 by the Bishop of Osnabrück, Philip of Katzenelnbogen (1141 to 1173), and the counts of Ravensberg in a feud with the lords of Holte.

Schloss Ledenburg in the municipality of Nemden (part of Bissendorf) was built as the "New" Holter Burg.

The Holter Burg was initially built as a tower castle on a plateau with a diameter of around 50 metres located on a rocky hill spur.

In 1997 and 2006 there were archaeological excavations and safety measures in order to preserve the castle and make it attractive for visitors.