Major Pieter Voltelyn Graham van der Byl MC (21 February 1889 – 21 January 1975) was a South African soldier and statesman. In South African politics, he was a member of the liberal South African Party and then the United Party from 1929 to 1966 and a member of Jan Smuts' cabinet from 1939 to 1948, during which time, he was minister of Native Affairs. Major Piet (as he was commonly known) was a chevalier de la Légion d'Honneur, Honorary Colonel of the University of Cape Town Regiment, as well as receiving the Military Cross and the King George VI Coronation Medal.