John Robert Hendricks (September 4, 1929 – July 7, 2007) was a Canadian amateur mathematician notable for his work in magic squares and hypercubes.
Hendricks was born in Regina, Saskatchewan, in 1929, moving with his family to Vancouver, British Columbia, at an early age.
Following his retirement, he gave many public lectures on magic squares and cubes in schools and in-service teacher's conventions in Canada and the northern United States.
He also developed a course on magic squares and cubes which he conducted for seven years at Acadia Junior High School in Winnipeg.
He purchased a personal computer to help with his self-published work on magic hypercubes, which until this point he had carried out using only a programmable calculator.