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Notable Unitarians

Notable Unitarians include classical composers Edvard Grieg and Béla Bartók; Ralph Waldo Emerson, Theodore Parker, Yveon Seon and Thomas Lamb Eliot in theology and ministry; Oliver Heaviside, Erasmus Darwin, Joseph Priestley, John Archibald Wheeler, Linus Pauling, Sir Isaac Newton and inventor Sir Francis Ronalds in science; George Boole in mathematics; Susan B. Anthony in civil government; Frances Ellen Watkins Harper, Whitney Young of the National Urban League, and Florence Nightingale in humanitarianism and social justice; John Bowring, Samuel Taylor Coleridge and Elizabeth Gaskell in literature; Frank Lloyd Wright in the arts; Josiah Wedgwood, Richard Peacock and Samuel Carter MP in industry; Thomas Starr King in ministry and politics; and Charles William Eliot in education. Julia Ward Howe was a leader in the woman suffrage movement, the first ever woman to be elected to the Academy of Arts and Letters, and author of the " Battle Hymn of the Republic ", volumes of poetry, and other writing. Although raised a Quaker, Ezra Cornell, founder of Cornell University in Ithaca, New York, attended the Unitarian church and was one of the founders of Ithaca's First Unitarian Church. Eramus Darwin Shattuck, a signatory to the Oregon State Constitution, founded the first Unitarian church in Oregon in 1865.

Eleven Nobel Prizes have been awarded to Unitarians: Robert Millikan and John Bardeen (twice) in physics; Emily Green Balch, Albert Schweitzer and Linus Pauling for peace; George Wald and David H. Hubel in medicine; Linus Pauling in chemistry; and Herbert A. Simon in economics.

Four presidents of the United States were Unitarians: John Adams, John Quincy Adams, Millard Fillmore, and William Howard Taft. Adlai Stevenson II, the Democratic presidential nominee in 1952 and 1956, was a Unitarian; he was the last Unitarian to be nominated by a major party for president as of 2020. Although a self-styled materialist, Thomas Jefferson was pro-Unitarian to the extent of suggesting that it would become the predominant religion in the United States.

In the United Kingdom, although Unitarianism was the religion of only a small minority of the population, its practitioners had an enormous impact on Victorian politics, not only in the larger cities – Birmingham, Leeds, Manchester and Liverpool – but in smaller communities such as Leicester, where there were so many Unitarian mayors that the Unitarian Chapel was known as the "Mayors' Nest". Numerous Unitarian families were highly significant in the social and political life of Britain from Victorian times to the middle of the 20th century. They included the Nettlefolds, Martineaus, Luptons, Kitsons, Chamberlains and Kenricks. In Birmingham, England, a Unitarian church – the Church of the Messiah – was opened in 1862. It became a cultural and intellectual centre of a whole society, a place where ideas about society were openly and critically discussed.