Gretta Duisenberg-Nieuwenhuizen (born Greetje Nieuwenhuizen on November 6, 1942, in Heerenveen, Friesland, Netherlands) is a Dutch activist and former nurse who grew up in a strict Reformed family in Haarlem, breaking away from her religious background in the 1960s and adopting the name Gretta. She was first married to internist Frits Bédier de Prairie from 1967 to 1975, with whom she had three children, one of whom was accused of drug possession and trafficking in Thailand in 2003. She married former Dutch Central Bank President Wim Duisenberg on August 21, 1987; he died on July 31, 2005, in their holiday home in France. Politically active since the late 1970s, she was a member of the Transnational Institute, the Pacifist Socialist Party (PSP), and later the Socialist Party (SP). She chaired Stichting Stop de Bezetting (Stop the Occupation) from 2002 to 2016, organizing petitions against Israeli occupation, and co-founded Stop de Muur (Stop the Wall) in 2004. Known for pro-Palestinian activism, she hung a Palestinian flag from her Amsterdam home balcony in 2002, participated in protests, visited Palestinian territories and met Yasser Arafat in 2003, protested the Gaza War in 2009 chanting 'Intifada, intifada, Palestina vrij!', and received the Prijs voor Mensenrechten from the Vlaamse Liga voor Mensenrechten. Her activism has sparked frequent accusations of antisemitism, including controversial statements on 'six million' signatures (2002), suicide bombings (2005), support for Hezbollah (2006), 'radical/Zionist Jews' (2010), and 'Jewish penetration of the Internet' (2014), leading to multiple investigations by the Dutch Public Prosecution Service and complaints from Jewish organizations like the Anne Frank Foundation and CIDI, though none resulted in prosecution. She has appeared on Dutch TV programs such as De wereld draait door, Pownews, and Het zwarte schaap.