Peter Rudolph Carlstein (born 28 October 1938 in Klerksdorp, Transvaal) is a former South African cricketer who played as a middle-order batsman in eight Tests from 1958 to 1964.He made his Test debut in the Fifth Test against Australia in 1957-58, scoring 32 in the first innings batting at number eight. He played all five Tests in England in 1960 but scored only 119 runs, making his top Test score of 42 in the Fifth Test at The Oval.