Alexander Thom (1894–1985) was a Scottish engineer.
Alexander Thom may also refer to:
Alexander Thom (surgeon) (1775–1845), Scottish military surgeon, judge and political figure in Upper Canada Alexander Thom (almanac editor) (1801–1879), Scottish publisher in Ireland Alexander Thom (footballer) (1894–1973), Scottish footballer See also James Alexander Thom (born 1933), American author