HNLMS K 3 () may refer to one of three ships of the Royal Netherlands Navy named K 3 or K III:
HNLMS K3 (1905), a , later Willem Warmont (1920), a patrol submarine HNLMS K3 (1941), sloop, captured by the Germans and commissioned in to the Kriegsmarine. Repaired after the war and returned to Dutch service as frigate Van Speijk