Mullion Cove or Porth Mellin is a small harbour and cove on the Lizard peninsula in south Cornwall, United Kingdom. It is situated facing west into Mount's Bay approximately six miles (9.7 km) south of the town of Helston and one mile (1.6 km) southwest of Mullion village. The harbour was completed in 1895 and financed by Lord Robartes of Lanhydrock as a recompense to the fishermen for several disastrous pilchard seasons. It is protected from southerly winter gales by two sea walls and Mullion Island, half a mile (0.8 km) offshore. The old pilchard cellar and net store are preserved. Mullion Cove lies within the Cornwall Area of Outstanding Natural Beauty (AONB). Almost a third of Cornwall has AONB designation, with the same status and protection as a National Park. Mullion Harbour, along with Mullion Island, was donated to the National Trust in 1945 by the Meyer family.