Kralj Petar Krešimir IV (pennant number RTOP-11) is Kralj-class missile boat in service with the Croatian Navy. It was laid down in 1990 at the Kraljevica Shipyard as the first ship in a new class being built for the Yugoslav Navy. As the Croatian War of Independence started gaining momentum, shipyard workers stalled the completion of the ship until the remaining Yugoslav forces retreated, preserving the ship for the Croatian Navy that was being formed. The ship was the main motive for a series of postage stamps issued by the Hrvatska pošta as well as souvenir coins.