John Duncan Wiley (born March 23, 1942, in Evansville, Indiana) is a faculty member and former chancellor of the University of Wisconsin–Madison.
He returned to UW–Madison as a faculty member in the College of Engineering in 1975, after having worked with Bell Telephone Laboratories and at the Max Planck Institute in Stuttgart, Germany as an awardee of the Alexander von Humboldt Senior U.S. Service Award for Research and Training.
His tenure as Chancellor was distinguished by record-breaking fund-raising efforts and a strong emphasis on strategic planning.
A number of new construction projects were begun during his tenure, including two new dormitories, a new Microbial Sciences Building, and major expansions to the Business and Medical Schools.
Wiley additionally devoted considerable attention early in his chancellorship to curbing binge drinking on campus through a grant from the Robert Wood Johnson Foundation.