Monier is a French surname. Notable people with the surname include:
Damien Monier (born 1982), French professional road bicycle racerGeorges Monier (1892–1974), Belgian composerJean Monier (or Mosnier) (1600–56), French painterJoseph Monier (1823–1906), one of the principal inventors of reinforced concreteLouis Monier (born 1956), founder of Internet search engine AltaVistaMonier Monier-Williams (1819–99), British IndologistPierre Monier (or Mosnier) (1641–1703), French painterSébastien Monier (born 1984), French-Mauritian footballerThomas Monier, French slalom canoer