The Siege of Namur () was a battle between Belgian and German forces around the fortified city of Namur during World War I. Namur was defended by a ring of modern fortresses, known as the Fortified Position of Namur and guarded by the Belgian 4th Division. When the siege began on 20 August, the German forces used experience gained at the Battle of Liège and bombarded the forts using German super-heavy siege artillery and four batteries on loan from Austria-Hungary, before attacking with infantry.