Henricus Antonius Franciscus Maria Oliva "Hans" van Mierlo (Dutch pronunciation: [ˈɦɑns fɑn ˈmiːrloː]; August 18, 1931 – March 11, 2010) was a Dutch politician of the Democrats 66 (D66). In 1966 Van Mierlo together with Hans Gruijters founded the Democrats 66. He served as Parliamentary leader in the House of Representatives for a total of 14 years, from February 16, 1967 until September 1, 1973 and from May 22, 1986 until August 19, 1994.