John Phillip Harison Acocks (7 April 1911 Cape Town – 20 May 1979 Middelburg, Eastern Cape), was a South African botanist noted for his publication "Veld Types of South Africa" and his extensive botanical collection of some 28 000 specimens from South Africa and Namibia.
In 1938 he was seconded to go on a joint collecting trip of four months with Swedish botanist Adolf Hjalmar Frederick Hafström between Cape Town and Victoria Falls.