A Tobrouk bunker is a small, reinforced concrete defensive structure used during World War II, particularly along the Atlantic Wall fortifications in France. These bunkers were typically designed to house machine guns or anti-tank weapons and provide protection for a small crew of soldiers. The term 'Tobrouk' derives from the Battle of Tobruk in North Africa, where similar defensive positions proved effective.
These structures are commonly found along the French coastline, especially in regions that were part of the German-occupied Atlantic Wall defensive system.