Leonardo's crossbow designs are a series of shooting weapon schematics designed by Leonardo da Vinci that are in the Codex Atlanticus. One version, a self-spanning infantry weapon called the Rapid Fire Crossbow (Balestra Veloce in Italian), is found on sheets 143r, 153r and 155r. The other is the Giant Crossbow (Balestra Gigante in Italian) design intended to be a mounted siege weapon found on sheet 149a in the Codex.