Haentjens is a surname. Notable people with the surname include:
Alphonse-Alfred Haentjens (1824–1884), French industrialist and politician Brigitte Haentjens, Canadian theatre director Charles Haentjens (1821–1874), Haitian diplomat and politician Clément Haentjens (1847–1923), Haitian diplomat and politician Marcel Haëntjens (1869–1915), French croquet player