William Gardiner may refer to:
William Gardiner (MP),
William Gardiner (clergyman) (1867-1941), twice tried for the Peasenhall Murder,
William Gardiner (composer) (1770-1853), English composer,
William Neville Gardiner (1748-1806), last British minister in Poland before its Third (and final) Partition,
William Tudor Gardiner (1892-1948), American politician and Governor of Maine,
William Guthrie Gardiner, businessman and philanthropist,
William H. Gardiner (born 1861), photographer
