William Barclay

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 (theologian) (1907–1978), theologian and writer of Bible commentaries
 * William Barclay (New York politician) (born 1969), New York State Assemblyman
 * William Barclay (Northern Ireland politician) (1873–1945), Northern Irish Senator
 * William Edward Barclay (1857–1917), football manager of Everton and of Liverpool