Petrus Hendrikus "Piet" van Zeil (3 August 1927 – 10 November 2012) was a Dutch politician of the defunct Catholic People's Party (KVP) and later the Christian Democratic Appeal (CDA) party and trade union leader. Van Zeil worked as a office clerk for Van Gend & Loos from April 1944 until May 1951 and as a trade union leader for the Dutch Trade Unions association (NVV) from May 1951 until February 1972 serving as General-Secretary from August 1968 until February 1972. Van Zeil served on the Municipal Council of Hillegom from April 1966 until May 1974.