William Calder

William Calder may refer to:

Politicians

 * William M. Calder, American politician
 * William Henderson Calder, New Zealand politician
 * William Calder (1767–1829), Lord Provost of Edinburgh 1810-11

Others

 * William Calder (footballer), Scottish footballer
 * William Calder (engineer) (1860–1928), from New Zealand
 * William Calder, of the Calder baronets