Peter Johnstone may refer to:
Peter Johnstone (mathematician) (born 1948), professor of mathematics Peter Johnstone (diplomat) (born 1944), Governor of Anguilla Peter Johnstone (rugby union) (1922–1997), New Zealand rugby union player Peter Johnstone Park, a sports ground in Mosgiel, New Zealand, named after him Peter Johnstone (footballer) (1887–1917), Scottish footballer
See also Peter Johnston (disambiguation)