Selling, carrying, bringing, or taking coal(s) to Newcastle is an idiom of British origin describing a pointless action.^[1] It refers to the fact that, historically, the economy of Newcastle upon Tyne in north-eastern England was heavily dependent on the distribution and sale of coal and therefore any attempt to sell coal to Newcastle would be foolhardy as supply would be greater there than anywhere else in Britain.^[1] Similarly, Newcastle, New South Wales (named after the British city) has one of the largest coal ports in the world, and hence it would also be meaningless to ship coals there.

In 1661–1662, John Graunt, in his work on the Bills of Mortality for London (published by the Royal Society 1665), uses the phrase in his introductory expression of gratitude to Lord John Roberts, the Lord Privy Seal: "... I should (according to our English Proverb) thereby carry Coals to Newcastle ...". The phrase thus predates the 1854 great fire of Newcastle and Gateshead by nearly two centuries and is thus not morbid humor in response to the fire.

The phrase is first documented in North America in 1679 in William Fitzhugh's letters ("But relating farther to you would be carrying Coals to new Castle")^[2] and first appears in a printed title in Labour in Vain: Or Coals to Newcastle: A Sermon to the People of Queen-Hith, 1709.

Timothy Dexter, an American entrepreneur, purportedly succeeded in defying the idiom in the 18th century by shipping coal to Newcastle. Renowned for his eccentricity and regarded as a buffoon, he was persuaded to sail a shipment of coal to Newcastle by rival merchants plotting to ruin him. He wrote that he instead got a large profit after his cargo arrived during a miners' strike which had crippled local production.^[3][4]

More prosaically, the American National Coal Association asserted that the United States profitably sold coal to Newcastle in the early 1990s,^[5] and 70,000 tonnes of low-sulphur coal was imported by Alcan from Russia in 2004 for their local aluminium smelting plant.

Although the coal industry of Newcastle upon Tyne is now practically non-existent, the expression can still be used today with a degree of literal accuracy, since the harbour of Newcastle in Australia (named for Newcastle in the UK after abundant coal deposits were discovered there and exploited by early European settlers^[6]) has succeeded its UK namesake by becoming the largest exporter of coal in the modern world.^[7]

With the increasing onset of globalisation, parallels in other industries occur, and the idiom is now frequently used by the media when reporting business ventures whose success may initially appear just as unlikely. It has been referred to in coverage of the export to India of saffron from Saudi Arabia and chicken tikka masala from the United Kingdom,^[8][9] the sale of Scottish pizzas to Italy,^[10] and the production of manga versions of William Shakespeare from Cambridge for Japan.^[11]

Even though its original geographic origin may have been displaced, this cliché continues to be used.^[12]

• Owls to Athens
• Pizza effect
• Samovar - A similar proverb for the Russian language, from Russian playwright Anton Chekhov, is "to bring one's own samovar (a type of tea pot) to Tula" (Russian: ездить в Тулу со своим самоваром). Unlike "Coals to Newcastle", the proverb retains its meaning to those who don't know the historical context as Russia's center of samovar production has always been Tula.

• The dictionary definition of Sell ice to Eskimos at Wiktionary
• The dictionary definition of Bring owls to Athens at Wiktionary