Joseph Pieter Anne Willem Molenaar (20 September 1945 – 30 August 2022) was a Dutch cricket umpire whose international career spanned from the early 1980s through to the early 2010s.
Molenaar first umpired an international match in 1983, when he officiated a match between the Dutch and Irish women's teams at the one-off Centenary Tournament in Utrecht. The following year, he umpired a women's One Day International (ODI) between the Netherlands and New Zealand, which was the Dutch team's first ODI. Molenaar's first major men's tournament was the 1990 ICC Trophy, which was hosted by the Netherlands. He officiated several group-stage matches and the semi-final between Bangladesh and Zimbabwe, and returned for the 1994 edition in Kenya.
