Maria Leer (June 20, 1788 – July 3, 1866) was a prophetess and Dutch religious figure, one of the leaders of the Zwijndrechtse nieuwlichters (Zwijndrecht New Lighters), a religious community with communist features which opposed social conventions. With Stoffel Muller, a barge skipper, she founded Zwijndrechtse nieuwlichters, and along with assistance from Dirk Valk, a Waddinxveen bailiff.