The Czech hedgehog (Czech: rozsocháč) or ježek, was a static anti-tank obstacle defence made of angled iron (that is, lengths with an L- or H- shaped cross section) deployed during World War II by various combatants.

The hedgehog is very effective in keeping tanks from getting through a line of defence. It maintains its function even when tipped over by a nearby explosion. Although it may provide some scant cover for infantry, infantry forces are generally much less effective against fortified defensive positions than mechanized units.

The Czech hedgehog's name refers to its origin in what is now the Czech Republic. The hedgehogs were originally used on the Czech-German border by the Czechoslovak border fortifications - a massive but never-completed fortification system built on the eve of World War II by Czechoslovakia. The fortification system fell to Germany in 1938 after the occupation of the Sudetenland as a consequence of the Munich Agreement.

Czech hedgehogs were widely used during World War II by the Soviet Union in anti-tank defence. They were produced from any sturdy piece of metal and sometimes even wood, including railroad ties. Czech hedgehogs were especially effective in urban combat, where a single hedgehog could block an entire street. Czech hedgehogs thus became a symbol of "defence at all cost" in the Soviet Union; hence the memorial to Moscow defenders, built alongside M-10 in 1966, is composed of three giant Czech hedgehogs.