John Robert Cunningham, OC (January 5, 1927 – January 4, 2020) was a Canadian medical physicist who was noted for his contributions in the development of computerized radiation treatment planning dose calculations in radiation therapy.

He is a pioneer in developing computational techniques for calculating absorbed dose from radiation beams,[3] and computer software and algorithms he developed continue to be used in both commercial and open source treatment planning systems.

Upon retirement from clinical medical physics in 1989, Cunningham became a consultant with Theratronics/MDS Nordion (Kanata, Ontario) until 1998 when he moved to Camrose Alberta.

He was an adjunct professor at the University of Alberta in Edmonton and regularly lectured at the Cross Cancer Institute in the Department of Medical Physics until 2018.

He and his wife Sheila lived in Calgary, Alberta, until his death on January 4, 2020 at the age of 92.