Jedidiah Grant Peterson was an American politician from Arizona.

He also held positions on the Arizona Highway Commission and the National Irrigation Congress, as well as being instrumental in the creation of the Roosevelt Dam.

He was a member of the Woodsmen of the World, Knights of Pythias, and the Odd Fellows.

[1] Peterson was one of Arizona's delegates to the original National Irrigation Congress in 1891.

From 1931 to 1946 he was employed as a livestock and land appraiser for the Salt River Valley Water Users' Association and the Arizona Farmers Credit Association.