Lemaître, Lemaitre, Le Maitre, or variation, is a French surname meaning "the master" – derived from the Latin word "magister". Notable people with the surname include:
Lemaître
Anne Lemaître (born 1957) Belgian applied mathematician
Georges Lemaître (1894–1966), Belgian Roman Catholic priest and astronomer, who formulated the "Big Bang" theory of cosmologic origin of the physical universe.