Lemaître or Lemaitre is a French surname meaning "the master" – derived from the Latin word "magister". Notable people with the surname include:
Lemaître:
Frédérick Lemaître (1800–1876), French actor and playwright
Georges Lemaître (1894–1966), Belgian Roman Catholic priest and astronomer.
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 unmanned spacecraft
Jules Lemaître (1853–1914), French critic and dramatist
Jean Lemaître, Belgian mechanical engineer, who developed a steam locomotive exhaust
Lemaitre:
Christophe Lemaitre (born 1990), French sprinter
Rafael Lemaitre, French carcinologist