Petrus Johann du Toit (16 March 1888 – 13 November 1967) was a noted South African veterinary scientist and the successor of Arnold Theiler as Director of Veterinary Services at Onderstepoort between 1927 and 1948.
He was the son of Daniel Francois du Toit (1846–1923), one of the founders of the Genootskap van Regte Afrikaners, and owner of the first Afrikaans newspaper, Die Patriot.