Mulier is a Dutch surname. Notable people with the surname include:
Pieter Mulier the Elder (ca.1610–1659), Dutch Golden Age painter Pieter Mulier II (1637–1701), Dutch Golden Age painter Pim Mulier (1865–1954), Dutch speed skater, and a leading figure in the sporting history of the Netherlands Rita Mulier (1934–2026), Belgian feminist author and economist
See also Hic Mulier, a pamphlet, published in England in 1620
de:Mulier