Willem Johan Herman Mulier, known as Pim Mulier (10 March 1865 – 12 April 1954) was one of the leading figures in sporting history of the Netherlands. He was founder of sports club Koninklijke HFC in 1879 and the first tennis club in the Netherlands in 1884. He also organized the first athletics competition and introduced cricket and hockey to the Netherlands. In 1891, Mulier, with the assistance of Charles Goodman Tebbutt, introduced bandy to the Netherlands.