People
* John Newcomen (c.1613–1630), English first white settler murdered by another white settler in Plymouth Colony, Massachusetts * Matthew Newcomen (c. 1610–1669), English nonconformist churchman * Thomas Newcomen (1663–1729), English ironmonger and inventorOther uses
* Viscount Newcomen, of Mosstown in the County of Longford, a title in the Peerage of Ireland * Newcomen baronets, of Kenagh in the County of Longford, a title in the Baronetage of Ireland * Newcomen Society, a British learned society * Newcomen Society of the United States, an educational foundation * Newcomen atmospheric engine, a device to harness the power of steam to produce mechanical work {{disambiguation, surname English-language surnames