Porthoustock is a hamlet near St Keverne in Cornwall, England, United Kingdom, on the east coast of Lizard Peninsula. Aggregates are quarried nearby and Porthoustock beach is dominated by a large concrete stone mill. The mill was once used to crush stone but is now disused. Coastal trading ships of up to can dock alongside the wharf along the southern edge of the beach to be loaded with stone. Fishing boats operate from the shingle beach, with lobster and crab potting, net fishing and long lining as the principal fishing methods. The South West Coast Path passes through Porthoustock.