Little David was the nickname of an American 36-inch (910 mm) caliber mortar designed to breach the Siegfried Line and then used for test-firing aerial bombs during World War II.

[1] The mortar was developed as an extension of a previous proposal to destroy heavy concrete fortifications such as the Siegfried Line with massive plastic explosive charges delivered by rocket or bomb.

During a discussion between representatives of the Ballistic Research Laboratory and the Office of the Chief of Ordnance it was suggested that instead of dropping such a charge from an airplane, it could be fired from a mortar.

[1] After the Siegfried Line was breached with conventional forces, Little David was instead considered for use against the extremely strong fortifications during the expected invasion of Japan.

With the closure of the Aberdeen Proving Ground Ordnance Museum and relocation to Fort Lee,[3] the status of Little David was previously in doubt as only restored pieces made the transfer.