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 Delphine Philippe-Lemaître, (1798–1863), French historian, archaeologist, botanist Frédérick Lemaître (1800–1876), French actor and playwright Georges Lemaître (1894–1966), Belgian Roman Catholic priest and astronomer, who formulated the "Big Bang" theory of cosmologic origin of the physical universe. Named for Georges Lemaître: Lemaître (crater), an impact crater on the Moon 1565 Lemaître, a minor planet the Friedmann–Lemaître–Robertson–Walker metric the Lemaître metric the Lemaître–Tolman metric Lemaitre (band), Norwegian indie electronic band Georges Lemaître ATV, an uncrewed spacecraft Jules Lemaître (1853–1914), French critic and dramatist Maurice Lemaître (1928–2018), French painter Jean Lemaître (mechanical engineer) (1898–1974), Belgian mechanical engineer, who developed a steam locomotive exhaust

Lemaitre Christophe Lemaitre (born 1990), French sprinter Pierre Lemaitre (born 1951), a French author and a screenwriter Rafael Lemaitre, French carcinologist

LeMaitre/Le Maitre George D. LeMaitre (1933–2018), American vascular surgeon LeMaitre Vascular, company founded by the surgeon in 1986 Jade Le Maître (fl. 2010s), a roboticist

See also Lemaitre (band), Norwegian indie electronic duo

Le Maistre (surname) Maitre (surname)