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.