The Cornish diaspora () consists of Cornish people and their descendants who emigrated from Cornwall, England. The diaspora is found within the United Kingdom, and in countries such as the United States, Canada, Mexico, Brazil, South Africa, Australia, New Zealand, and the Samoas.

Background Cornish emigration was caused by a number of factors, mainly economic, notably a lack of work in the 18th and 19th centuries. During this period many Cornish people or "Cousin Jacks", as they were known, migrated to other parts of the world in search of a better life."Cousin Jacks" is a nickname for the overseas Cornish, thought to derive from the practice of Cornishmen asking if job vacancies could be filled by their cousin named Jack in Cornwall. (1) (2) Many skilled miners sought the opportunity to find work abroad, as a consequence of the decline of the tin and copper mining industries in Cornwall. It is estimated that 250,000 Cornish migrated abroad between 1841 and 1901.

The Keweenaw Peninsula of Michigan's Upper Peninsula became the most concentrated destination for Cornish miners in North America following the opening of commercial copper mining in the Lake Superior district in 1844. The first Cornish miners recorded in the region were recruited from Mineral Point, Wisconsin, by Colonel Charles Gratiot, one of the earliest company agents to operate in the area. By the 1860s, Cornish miners had introduced two of their signature technologies to the district: the Cornish pump, a steam powered pumping engine originally developed for the deep mines of Cornwall, and the Cornish stamp mill for ore processing. The Cornish presence shaped the cultural landscape of the peninsula, with Methodist chapels, pasty shops, and Cornish wrestling traditions taking root in mining communities. Today the ghost town of Central Mine preserves a Cornish Methodist church from the period, and two affiliated organisations, Keweenaw Kernewek and the Cornish Connection of Lower Michigan, continue to serve descendants in the state.

The Cornish economy profited from the work abroad. Some men sent back "home pay", with which they tried to help keep their families out of the workhouse. As well as their mining skills, the Cornish emigrants carried their culture and way of life with them when they travelled. They formed tight-knit communities, and maintained some contact with the people and/or the customs of their homeland. Wrestling competitions took place in the new settlements, Cornish Methodist chapels were constructed. Pasties and saffron cakes became known to many natives of Australia, the Caribbean, and the United States. In areas where there are no mines, this may be due to Cornish seamen among the crews of British Royal Navy vessels. In some locations, the playing of brass bands and the singing of Cornish carols shows an example of Cornish culture's influence.

Rugby union was played overseas by the Cornish miners, this helped develop the game in Australia, New Zealand and South Africa. Teams from these nations have returned the compliment, and have played in Cornwall (New Zealand 1905, 1924, Australia 1908, South Africa 1906, 1912 and the Māori in 1926).

Specific locations Today, in many native Anglophone and some Hispanic countries, some of the descendants of these original migrants celebrate their Cornish ancestry. This is evidenced by the existence of both Cornish societies and Cornish festivals in these countries, as well as a growing overseas interest in the Cornish language. Many of those with Cornish ancestry are now reviving their heritage and a plethora of Cornish family history and genealogy groups exist.

Australia

Today the most famous area of Cornish culture, called 'Australia's Little Cornwall', is the area in South Australia known as the Copper Triangle. This mining area in the northern Yorke Peninsula, including the principal towns of Moonta, Kadina and Wallaroo, was a source of prosperity for colonial South Australia in the late 19th and early 20th centuries. In its heyday Moonta was South Australia's second largest town after Adelaide and was predominately settled by Cornish miners and their families. Today Moonta is most famous for its traditional Cornish pasties and its Cornish style mine engine houses. Many descendants of these Cornish families still live in the Copper Triangle and are intensely proud of their Cornish heritage. Many of the original miners' cottages made from wattle and daub still stand and are still lived in by local residents, and many streets and houses have Cornish names. In Moonta today, the Kernewek Lowender (Cornish for "Cornish happiness") is the largest Cornish festival in the world and attracts more than 40,000 visitors each event.

The South Australian town of Burra also has Cornish connections. Burra began with the discovery of copper in 1845, by shepherds Thomas Pickett and William Streair. A number of townships soon developed - the South Australian Mining Association town of Kooringa, plus Redruth (Cornish) Aberdeen (Scottish) Llywchwr (Welsh) and Hampton (English). This former copper mining town is listed on the National Estate Register and also declared a State Heritage Area. The great Burra Jinker holds pride of place in Market Square. It was once pulled by some 40 bullocks, four abreast. Straining to the vivid exhortations of six bullock drivers under the leadership of William Woollacott, they hauled the massive jinker for three months, on a 100-mile journey from Adelaide. In April 2001 the Jinker was included in the BankSA Heritage Icons List.

An example of the extent of the Cornish diaspora are the miners who worked at the Geraldine mine in Western Australia and had an influence on the nearby town of Northampton. Their produce was shipped out of Port Gregory, Western Australia in small vessels like the tramp steamer SS Xantho and then transhipped to the port of Geraldton where it was loaded onto wool ships bound for England as a form of 'paying ballast'.McDonald, G. K. The Little Boat Harbour: history of Port Gregory. WA Museum, Fremantle.

Two of Australia's prime ministers are known to have Cornish ancestry. Robert Menzies was partially Cornish, while Bob Hawke was entirely of Cornish descent. In addition, at least six Premiers of South Australia have been of Cornish origin. Ruse, New South Wales was named after James Ruse, known as Australia's first farmer, who had been transported from Cornwall.

Brazil Cornish miners played a major role in gold mining in imperial Brazil. The Gongo Soco gold mine, operated by the Imperial Brazilian Mining Association of Cornwall using skilled Cornish miners, produced over of gold between 1826 and 1856. Of particular note was Cornish miner Thomas Bawden (Scorrier, 1814-Mariana, Brazil, 1886), who had migrated to Brazil as a young man to make his fortune, and who on June 1, 1859 bought, for a very modest price, the gold ore exploring rights of "Mina da Passagem" (in Mariana, the first city and first capital of Minas Gerais Province), then believed to be practically exhausted, from the estate of then recently deceased mineralogy pioneer Baron von Eschwege (Wilhelm Ludwig Freiherr von Eschwege, a German engineer who had been charged by the King, D. João VI, to survey Brazilian mineral resources and establish ways of exploitation. See Eschwege's book: Pluto Brasiliensis). After more than four years managing the enterprise, Bawden, now a successful businessman, sold the whole of it, for a remarkably high price, to the newly constituted single-purpose business "Anglo-Brazilian Gold Mining Company", managed by the experienced Thomas Treloar (Sithney, 1814-London, 1880), who also came from Cornwall. The company received, in 1867, the official visit of Sir Richard Francis Burton, former Africa and Middle East explorer, then acting as consul to Brazil within the British diplomatic service. Consul Burton, a renowned linguist and intellectual as well, described (in the book Explorations of the Highlands of Brazil, 1869) how he had found there a large Cornish community, whose church services included hymns sung in the Cornish language, and had witnessed their eccentric rite of "Baptism for the dead", based on the apostle Paul's First Epistle to the Corinthians 15:29. The "Anglo-Brazilian" project turned out to be a success and, using newly developed Cornish gold extraction engineering technologies, the "Mina da Passagem" eventually kept producing large amounts of gold for around ninety years more.

Canada

The oldest and largest area of settlement from the West Country in Canada is that of the northern shore of Newfoundland, also known as the French Shore, due to competing fishing rights. The Cornish made up a significant part of this population, which is noticeable in the local dialect to this day. There are also significant populations of Cornish descent in other areas of Atlantic Canada, in particular, Prince Edward Island. In the first half of the 19th century Padstow was a significant port of embarcation for Cornish emigrants bound for Canada.Beacham, Peter & Pevsner, Nikolaus (2014) Cornwall. (The Buildings of England.) New Haven: Yale University Press; p. 389 During the mid-19th century, ships carrying timber from Canada (particularly Quebec City) arrived at Padstow and offered cheap travel to passengers wishing to emigrate. Among the ships that sailed were the barques Clio, Belle and Voluna; and the brig Dalusia. In Ontario, Oshawa and the surrounding Ontario County were the settling grounds of a large number of 19th century Cornish immigrants during the Cornish emigration which considerably reduced Cornwall's population, although these were largely agricultural workers, rather than miners. Bruce mines in Ontario was an exception where Cornish mine workers started the first commercial copper mine in Canada.There were also major Cornish settlements in the Prairie provinces, and on Vancouver Island.

Cornish ethnicity is recognised on the Canadian census, and in 2006 1,550 Canadians listed their ethnic origin as Cornish.

The name of Cornwall, Ontario however does not indicate settlement by Cornish people since it was named after one of the Dukes of Cornwall (its flag and coat of arms are therefore based on elements from the Duchy of Cornwall).

Mexico

In the State of Hidalgo in central Mexico a local speciality originates from the Cornish pasty, called pastes which was introduced by miners and workers from Cornwall who were contracted in the silver mining towns of Mineral del Monte and Pachuca. The majority of migrants to this region came from Camborne and Redruth. Mineral del Monte's steep streets, stairways and small squares are lined with low buildings and many houses with high sloping roofs and chimneys which indicate a Cornish influence. It was the Cornish who first introduced football to Pachuca and indeed Mexico, as well as other popular sports such as Rugby union, Tennis, Cricket, and Polo, while Mexican remittances helped to build the Wesleyan Chapel in Redruth the 1820s. The twin silver mining settlements of Pachuca and Real del Monte are being marketed in 2007 as 'Mexico's Little Cornwall' by the Mexican Embassy in London and represent the first attempt by the Spanish speaking part of the Cornish diaspora to establish formal links with Cornwall. The Mexican Embassy in London is also trying to establish a town twinning arrangement with Cornwall. In 2008 thirty members of the Cornish Mexican Cultural Society travelled to Mexico to try and re-trace the path of their ancestors who set off from Cornwall to start a new life in Mexico.

New Zealand