Lemmens is a Dutch patronymic surname derived from "Lambert's son". The name is particularly popular in Belgian Limburg where it is the ninth most common last name. Notable people with the surname include:
Alfons Lemmens (1919–2013), Dutch footballerAn Lemmens (born 1980), Belgian presenterErwin Lemmens (born 1976), Belgian professional soccer playerGertrude Lemmens (1914–2000), Dutch Roman Catholic sister and missionaryHelen Lemmens (1834–1906), English soprano, wife of Jacques-Nicolas LemmensJacques-Nicolas Lemmens (1823–1881), Flemish composer and organistJean-Nicolas Lemmens (1850–1897), Dutch Catholic priest and Canadian bishopLeon Lemmens (born 1954), Belgian Roman Catholic auxiliary bishopStacy Lemmens (1998–2006), Belgian murder victimSalesius Lemmens (1904–1942), Dutch Apostolic Prefect of the Order of Friars MinorLemmen:
Celina Lemmen (born 1985), Dutch swimmerGeorges Lemmen (1865–1916), Belgian neo-impressionist painter