John William Chapman (September 8, 1894 – August 17, 1978) was the 37th Lieutenant Governor of Illinois.

He entered private practice in Chicago in the 1920s until he moved to Springfield, Illinois in 1941.

In 1927, he was elected an Alderman on the Chicago City Council for the 40th ward and served for one term before losing to Joseph C. Ross in 1929.

[1] He served as executive secretary to Illinois Governor Dwight H. Green from 1941 to 1949.

In 1941 he was appointed to the Illinois Parole Board serving until March 1950.