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Village in Cornwall, England

Porthcurno (, meaning "pinnacle cove", see below) is a small village covering a small valley and beach on the south coast of Cornwall, England in the United Kingdom. It is the main settlement in a civil and an ecclesiastical parish, both named St Levan, which comprise Porthcurno, diminutive St Levan itself, Trethewey and Treen. It is centred 6.6 mile (11 km) west of the railway, market, and resort town of Penzance and 2.5 mile (4 km) from Land's End, the most westerly point of the English mainland. Road access is via the north end of the valley along a long cul de sac with short branches off the B3283 and land traditionally associated with the village, including its beach, is on the South West Coast Path. The route is marked as two hours from Land's End or about four hours walk from Penzance for the most agile cliff side path walkers. A low frequency bus service links Penzance, Lands End and nearby villages and hamlets including Newlyn, Paul, Sheffield, Lamorna, St Buryan, Treen, Trethewey, Polgigga and Sennen. Porthcurno is largely not farms or fisherman's cottages today, having its linear centre inland, centred 6.6 mile (11 km) west of the railway, market, and resort town of Penzance and 2.5 mile (4 km) from Land's End, the most westerly point of the English mainland. In most local level organisational and community bodies, it is in civil and ecclesiastical parishes named Saint Levan and usually spelled as St Leven since the 18th century.

Porthcurno is unusually well known for its size because of its history as a major international submarine communications cable station. In the late nineteenth century, the remote beach at Porthcurno became internationally famous as the British termination of early submarine telegraph cables, the first of which was landed in 1870, part of an early international link stretching from the UK to India, which was then a British colony. Porthcurno was chosen in preference to the busy port of Falmouth because of the reduced risk of damage to the cables caused by ships' anchors. In 1872, the Eastern Telegraph Company (ETC) Limited was formed which took over the operation of the cables and built a cable office in Porthcurno valley. The concrete cable hut, where the cable shore ends were connected to their respective landlines, is a listed building and still stands at the top of the beach. ETC and its cable operations expanded through the late nineteenth and early twentieth centuries, in 1928 to merge with Marconi's Wireless Telegraph Company Limited to form Imperial and International Communications Limited which was renamed Cable and Wireless Limited in 1934. Cable and Wireless Limited was a predecessor company of Cable & Wireless Worldwide and Cable & Wireless Communications. In the inter war years, the Porthcurno cable office operated as many as 14 cables, for a time becoming the largest submarine cable station in the world, with the capacity to receive and transmit up to two million words a day. Porthcurno is still known colloquially by the acronym 'PK' being represented in Morse code as 'di dah dah dit' followed by 'dah di dah', communicating with a line operator and testing connections, an acronym often sent. Over the years, many apprentices were trained at the Porthcurno cable office in telegraphy and supporting skills, initially by ETC and then by Cable and Wireless. To improve security, a network of two parallel tunnels, connected by two smaller cross tunnels, was bored into the granite valley east side by local tin mining labourers, starting in June 1940, to accommodate the essential telegraph equipment. Each of the two main entrances was protected by offset double bomb proof and gas proof doors. To provide evacuation for staff in case the defences failed, a covert emergency escape route was provided by granite steps cut into a steeply rising fifth tunnel leading from the rear cross tunnel to a concealed exit in the fields above. The concrete defences around the tunnel entrances and the nearby buildings were camouflaged with the help of a local artist: the design, when viewed from the air with some imagination, resembled a belt of trees, complete with rabbits and birds. The tunnel environment being secure, dry, and at a virtually constant temperature proved to be ideal for the sensitive telegraph equipment and it continued to house the subsequently upgraded equipment after the war until the cable office closure in 1970. It was then used for training facilities for the Engineering College until the college itself also closed in 1993. Today the tunnel houses exhibits of, and is itself an exhibit of, the Museum of Global Communications, operated by PK Porthcurno.

About halfway along the main coastal footpath from Porthcurno to Logan Rock another path loops off to the cliffs above Pedn Vounder beach. Beside this is a pyramid built from granite blocks and painted white, about tall. For navigation, it replaced a brightly coloured hut which housed the termination of another submarine telegraph cable connected to the French port of Brest owned by La Compagnie Française de Telegraphe de Paris à New York, which was laid in 1880. Overhead lines carried the signals to and from Penzance which had the cable office. Some of the stone ducting which was built up on the cliffside to protect the cable is still visible from the footpath nearby. This was part of the first cable connection from the UK to the American continent passing from Porthcurno to Brest and then via the trans Atlantic cable first to Saint Pierre and Miquelon near the coast of Canada, and then a further to Cape Cod, Massachusetts. In 1919, another Compagnie Française cable was laid to Porthcurno but this was terminated in the Cable Hut at the top of the beach a few hundred yards to the west where it remained in operation until 1962.

The Logan Rock headland, about 30 minutes' walk from Porthcurno to the east along the coastal footpath around Porthcurno Bay is famous for the 80 ton granite rocking stone (Logan Rock) perched at the top of the middle outcrop of rocks on the small rocky peninsula. Millennia of erosion had balanced it so finely that one person could move it easily. In 1824, a group of sailors led by Lieutenant Hugh Calville Goldsmith, nephew of the poet Oliver Goldsmith, and the worse for drink climbed up to Logan Rock armed with crowbars and dislodged it, allowing it to fall down the cliff. Such was the disgust of the local people at this blatant act of vandalism, that they complained to the Admiralty and Goldsmith was ordered to replace the rock at his own expense. It took seven months, 60 labourers and cost Goldsmith £130 8s d at 1824 prices (130.4 in 1824 is equivalent to about <calculated amount> in recent years) to replace it. The original invoice for equipment and labour is now displayed on the wall of The Logan Rock public house in the nearby village of Treen. Just to the north of the peninsula is evidence of an Iron Age cliff fort called Treryn Dinas, a scheduled monument comprising about five ramparts, ditches and some evidence of round dwelling huts. There is a small rocky island off the Logan Rock peninsula called Horrace and another smaller granite island called Great Goular which is only visible at low tide. The local area has some of the highest average annual air temperatures of the United Kingdom. In common with much of the south Cornish coast, summer daily maxima rarely exceed about 25 degrees Celsius (77°F) and below freezing temperatures and frost are uncommon. The lower valley and beach enjoy a micro climate being sheltered from winds in most directions. For the more exposed cliff top areas, gale force winds are common throughout the year which occasionally cause moderate structural damage to buildings locally. In the summer months, Porthcurno is popular with families on holiday with young children who enjoy playing on the beach and perhaps some supervised bathing, as the beach is prone to strong rip currents. In the quieter seasons visitors tend to be local people and day trippers from other parts of Cornwall. Many tourists come from elsewhere in the United Kingdom and abroad and may have rented self catering or bed and breakfast accommodation nearby. The Porthcurno Telegraph Museum and the Minack Theatre, both bring visitors to the area.

The name Porthcurno evolved from the 16th century Cornish spelling 'Porth Cornowe'. In the Cornish language 'porth kornow / porth cornow' (standard written form uses "c") meant 'cove/landing place of horns or pinnacles', a reference to the granite rock formations in the vicinity. Some evidence of early commercial port activity exists in the remains of man made stone tracks for horse drawn vehicles which may have provided access to the beach, visible on one of the footpaths near the south side of the car park ascending the east side of the valley.

Development of the area was dominated for over one hundred years by the operations of the cable station owned by Cable and Wireless plc and its predecessor companies. Probably over 90% of the inhabitants were either employees of Cable and Wireless or were directly supported by it. During the Second World War, Porthcurno was designated a Vulnerable Point and was heavily defended and fortified as a part of British anti invasion preparations. At the beginning of the war a small guard of special constables was put on duty at the cable office and cable house, later superseded by a platoon of soldiers who camped on a former bowling green. Passes were issued to residents and visitors who had business to be in the area and many mock attacks were staged. The defences included pillboxes and a petroleum warfare beach flame barrage which could be operated remotely from the tunnel. Each of these has thousands of times the capacity of all of their predecessors' cables put together. However, all of the successors of the telegraph cables today use Porthcurno merely as a shore landing point for connecting to the national telecommunications network, passing directly via landlines buried under the local roads to a terminating station at Skewjack about 2 mile (3 km) inland from Porthcurno. Much of the beach and surrounding shores previously owned by Cable and Wireless was donated to the National Trust in 1993. It was thought that this was used to 'spy' on the early wireless transmissions by Marconi, a developer of radio, from the Poldhu cliff top about 17 mile (27 km) to the east, across Mount's Bay on the west side of the Lizard Peninsula.

Pedn men an Mere overlooks the small secluded tidal beach of Porth Chapel to the west. Porth Chapel beach is named after the remains of a Christian site and medieval chapel visible next to the footpath about above the beach.