The Hedgehog was an anti-submarine weapon developed by the Royal Navy during World War II, that was deployed on convoy escort warships such as destroyers to supplement the depth charge. The weapon worked by firing a number of small spigot mortar bombs from spiked fittings. Rather than working on a time or depth fuze like depth charges, the bombs exploded on contact and achieved a higher sinking rate against submarines than depth charges did. Hedgehog received its name because when unloaded, the rows of empty spigots resembled the spines of a hedgehog. Hedgehog, also known as an Anti-Submarine Projector was developed by the Directorate of Miscellaneous Weapons Development based on the British Army's Blacker Bombard and entered service in 1942. Hedgehog was replaced in new construction for the Royal Navy by the more effective Squid mortar in 1943. Squid was in turn replaced by the three-barreled Limbo. The United States produced a rocket version of Hedgehog called Mousetrap.

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