Magdalena Antoinette Maria 'Marleen' Barth (born 21 March 1964) is a Dutch politician of the Labour Party (PvdA) and trade unionist, and a former journalist.

Magdalena Antoinette Maria Barth was born on 21 March 1964 in Den Helder in the Netherlands.^[1]

Barth studied political science with a specialty in public administration at the University of Amsterdam.^{[citation needed]}

Barth worked as a parliamentary reporter for Trouw (1990–1997), was a member of the House of Representatives (1998–2002), a member of the States-Provincial of North Holland (2003–2004), and chair of CNV Onderwijs (Christian teachers' union) (2005–2008).^[1] She was chair of GGZ Nederland (organisation for mental health) from 2008 to 2013.^[1]

She was lijsttrekker for the Labour Party in the Dutch Senate election of 2011 and 2015.^{[citation needed]} From 7 June 2011, she was a member of the Senate as well as Senate group leader of the Labour Party.^[1] She stepped down as member of the Senate on 8 February 2018, after a controversy about her vacation during a Senate debate.^[2]

Marleen Barth is married to former D66 MP Jan Hoekema, (second marriage for both) who has been mayor of Wassenaar from 2007 to 2017.^{[citation needed]}