Thomas Carolus "Thom" de Graaf (; born 11 June 1957) is a Dutch politician of the Democrats 66 (D66) party and jurist. He is the Vice-President of the Council of State since 1 November 2018. De Graaf attended the City Gymnasium Nijmegen from April 1969 until May 1975 and applied at the Radboud University Nijmegen in June 1975 majoring in Law obtaining a Bachelor of Laws degree in June 1977 and worked as a student researcher before graduating with a Master of Laws degree in July 1981. De Graaf served on the Municipal Council of Nijmegen from May 1978 until April 1979. De Graaf worked as a researcher at the Radboud University Nijmegen and the Centre for Parliamentary History from July 1981 until September 1985. De Graaf worked as a civil servant for the Ministry of the Interior from September 1985 until May 1994 for the department for Law Enforcement from September 1985 until February 1986 and as Deputy Director-General of the department for Legislative Affairs from February 1986 until August 1988 and as Deputy Director-General of the department for Legal Affairs from August 1988 until September 1991 and as Deputy Director-General of the department for Law Enforcement from September 1991 until May 1994. De Graaf served on the Municipal Council of Leiden from April 1990 until May 1994. De Graaf was elected as a Member of the House of Representatives after election of 1994, taking office on 17 May 1994 serving as a frontbencher and spokesperson for the Interior, Kingdom Relations, and Law enforcement and deputy spokesperson for Foreign Affairs and European Affairs. After the Parliamentary leader of the Democrats 66 in the House of Representatives Gerrit Jan Wolffensperger announced that he was stepping down as Parliamentary leader in the House of Representatives following increasing criticism on his leadership, the Democrats 66 leadership approached De Graaf as his successor, De Graaf accepted and became the Parliamentary leader in the House of Representatives, taking office on 21 November 1997. After the election of 1998 the new Leader of the Democrats 66 Els Borst was elected as a Member of the House of Representatives and became the Parliamentary leader, taking office on 19 May 1998. Following the cabinet formation of 1998 Borst opted to remain Minister of Health, Welfare and Sport in the Cabinet Kok II and unexpectedly announced that she was stepping down as Leader. De Graaf announced his candidacy