Anthony Alastair Johnstone (born 2 May 1956) is a Zimbabwean professional golfer.Johnstone was born in Bulawayo, Rhodesia and attended Christian Brothers College. He lives in Sunningdale in England. He turned professional in 1979 and has spent his career playing mainly on the Southern African Sunshine Tour and in Europe. He won six times on the European Tour and finished a career best seventh on the European Tour Order of Merit in 1992.