William Calder may refer to:
Politicians William M. Calder (1869–1945), American politician William Henderson Calder (fl. 1870s), New Zealand politician William Calder (lord provost) (1767–1824), Lord Provost of Edinburgh 1810–11
Others William Calder (footballer) (1868–1936), Scottish footballer Bill Calder (1934–2021), Scottish footballer William Calder (engineer) (1860–1928), from New Zealand William Calder (1821–1887), of the Calder baronets
See also Calder (disambiguation)