Pieter Kooijmans received four ribbon bars, including the "Knight of the Order of the Netherlands Lion" on April 11, 1978, and an honorific title, "Minister of State" on July 13, 2007.
Ribbon bar Knight of the Order of the Netherlands Lion 11 April 1978 Commander of the Order of Orange-Nassau Knight of the Order of the Gold Lion of the House of Nassau Grand Cross of the Order of Merit Ribbon bar Minister of State 13 July 2007 
