William Haller (1885 – 1974) was an American historian of Puritanism.The Letters of George Santayana: Book Six 1937–1940, ed. William G. Holberger (Cambridge, Massachusetts: The MIT Press, 2001), p. 240.L. J. Trinterud, 'William Haller, Historian of Puritanism', Journal of British Studies, Vol. 5, No. 2 (May 1966), pp. 33-55.

Works Books The Early Life of Robert Southey, 1774–1803 (New York: Columbia University Press, 1917). Tracts on Liberty in the Puritan Revolution, three volumes (New York: Columbia University Press, 1934). The Rise of Puritanism, or, the Way to the New Jerusalem as Set Forth in Pulpit and Press from Thomas Cartwright to John Lilburne and John Milton, 1570–1643 (New York: Columbia University Press, 1938). The Leveller Tracts, 1647–1653, co-edited with Godfrey Davies (New York: Columbia University Press, 1944). Liberty and Reformation in the Puritan Revolution (New York: Columbia University Press, 1955). Foxe's Book of Martyrs and the Elect Nation (London: Jonathan Cape, 1963). Elizabeth I and the Puritans (Ithaca, New York: Cornell University Press, 1964).

Articles 'Byron and the British Conscience', The Sewanee Review, Vol. 24, No. 1 (January 1916), pp. 1-18. 'Order and Progress in Paradise', PMLA, Vol. 35, No. 2 (1920), pp. 218-225. 'Southey's Later Radicalism', PMLA, Vol. 37, No. 2 (June 1922), pp. 281-292. 'Before Areopagitica', PMLA, Vol. 42, No. 4 (December 1927), pp. 875-900. 'The Puritan Art of Love', co-authored with Malleville Haller, Huntington Library Quarterly, Vol. 5, No. 2 (January 1942), pp. 235-272. '"For the Liberty of Unlicenc'd Printing"', The American Scholar, Vol. 14, No. 3 (Summer 1945), pp. 326-333. '"Hail Wedded Love"', ELH, Vol. 13, No. 2 (June 1946), pp. 79-97. 'Two Early Allusions to Milton's "Areopagitica"', Huntington Library Quarterly, Vol. 12, No. 2 (February 1949), pp. 207-212. 'The Word of God in the Westminster Assembly', Church History, Vol. 18, No. 4 (December 1949), pp. 199-219. 'The Word of God in the New Model Army', Church History, Vol. 19, No. 1 (March 1950), pp. 15-33 '"What Needs My Shakespeare?"', Shakespeare Quarterly, Vol. 3, No. 1 (January 1952), pp. 3-16. 'Milton and the Protestant Ethic', Journal of British Studies, Vol. 1, No. 1 (November 1961), pp. 52-57.

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