William Barclay may refer to:
William Barclay (jurist) (1546–1608), Scottish jurist William Barclay (writer) (c. 1570–c. 1630), Scottish writer William Barclay (painter) (1797–1859), English miniature painter William Barclay (Northern Ireland politician) (1873–1945), Northern Irish Senator William Barclay (theologian) (1907–1978), theologian and writer of Bible commentaries William A. Barclay (born 1969), New York State Assemblyman William Edward Barclay (1857–1917), football manager of Everton and of Liverpool Bill Barclay (died 2001), American athlete and coach
See also William Berkeley (disambiguation)