Alexander Williamson

Alexander Williamson may refer to:


 * Alexander William Williamson (1824–1904), chemist who discovered the Williamson ether synthesis reaction
 * Alexander Williamson (missionary) (1829–1890), Scottish Protestant missionary to China with the London Missionary Society
 * Alexander Watt Williamson (1849–1928), New Zealand schoolteacher
 * Alexander Williamson (colonial administrator) from 1897 Diamond Jubilee Honours