The Ersatz Monarch-class (Replacement Monarch-class) battleship was a projected new class of four battleships which were to be constructed for the Austro-Hungarian Navy in 1914–1919. Designed to replace the Monarch class of coastal defense ships, each of the battleships were to carry ten L/45 guns as their primary armament, a slight improvement over her predecessors, the Tegetthoff class. The ships were and were designed to displace .