Lammens is a surname. Notable people with the surname include:
Albert Lammens (1890–1933), Belgian tennis player Hank Lammens (born 1966), Canadian ice hockey player Henri Lammens (1862–1937), Belgian Orientalist historian and Jesuit Manon Lammens (born 1991), Belgian swimmer Matías Lammens (born 1980), Argentine politician Senne Lammens (born 2002), Belgian footballer