Cornelis "Kees" Staf (23 April 1905 – 10 September 1973) was a Dutch politician of the defunct Christian Historical Union (CHU) party now merged into the Christian Democratic Appeal (CDA) party and businessman. Staf remained in active politics, he became a Member of the Senate after the death of Gualthérus Kolff, taking office on 9 June 1959. In August 1960 Staf announced that he would not stand for the Senate election of 1960 and continued to serve as a backbencher until the end of the parliamentary term on 20 September 1960.