HNLMS Utrecht (D817) (Dutch: Hr.Ms. Utrecht) was a destroyer of the Friesland class. The ship was in service with the Royal Netherlands Navy from 1957 to 1980. The destroyer was named after the Dutch province of Utrecht and was the eighteenth ship with this name. In 1980 the ship was taken out of service and sold to Peru where it was renamed Castilla. The ship's radio call sign was "PAEY".[1]
In 1959 the ship received eight torpedo tubes so it could use the British MK 20E torpedo. After a few years these were removed however, because the Dutch navy favored American torpedoes.[3]