Alexander Moncrieff is the name of:
Alexander Bain Moncrieff (1845–1928), Irish-born engineer, active in Australia Alexander Moncrieff, Lord Moncrieff (1870–1949), Scottish lawyer and judge Alexander Moncrieff (minister) (c. 1613 – 1688), Scottish Presbyterian preacher Alexander Moncrieff (Secession minister) (1695–1761), Scottish Presbyterian minister