运煤到新堡(taking coal(s) to Newcastle) 是一句英文的熟语，表示有勇无谋的行动或是多此一举。 其典故来由，是因为位于英格兰东北部的泰恩河畔新堡，在经济发展上曾经大量依赖煤的生产，该地区开采煤矿的历史起于1538年。每年有15,000公吨的煤产自此地，是以若是其它地方想要向新堡兜售煤都将无功而返，这是简单的供给和需求原理。原文 "To carry Coals to Newcastle" 最早的书面数据，是在1679年的北美，一封由William Fitzhugh 所写的信中"But relating farther to you would be carrying Coals to new Castle."而最早见诸报章则是一篇文章的标题：Labour in vain: or Coals to Newcastle: A sermon to the people of Queen-Hith, 1709.

Selling, carrying, bringing, or taking coal(s) to Newcastle is an idiom of British origin describing a foolhardy or pointless action. 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—by the time of the first known recording of the phrase in 1538, 15,000 tonnes of coal were being exported annually from the area—and therefore any attempt to sell coal to Newcastle would be doomed to failure because of the economic principle of supply and demand.