Martinus Johannes "Martin" van Rooijen (born 31 July 1942) is a Dutch politician and businessman. A member of the 50PLUS (50+) party, he was previously part of the defunct Catholic People's Party (KVP), now merged into the Christian Democratic Appeal (CDA) party He is the parliamentary leader of 50PLUS in the Senate and a Member of the Senate since 11 June 2019.