Charles Walter Harper (27 January 1880 – 1 July 1956) was an Australian agriculturalist who was prominent in the cooperative movement in Western Australia.

The company's 1927 foray into superphosphates (a joint venture now known as CSBP) was a pet project, as it was based on soil research that he himself had done years earlier in conjunction with William Grasby.

A "frugal, abstemious, reserved man", Harper requested only £600 a year for most of his tenure, and his personal conservatism was often reflected in the way the company operated.

He was also a trustee of the Cooperative Wheat Pool of Western Australia and an officeholder in the Fruit Growers' Association.

Harper helped establish Cooperative Bulk Handling (CBH) in the early 1930s, which was initially aligned with Wesfarmers but later became independent.