Stephen George Nichols Jr. (born October 24, 1936) is an American medievalist.
Nichols earned a bachelor's degree from Dartmouth College and completed a doctorate in comparative literature from Yale University.
Upon graduation, he began teaching at the University of California, Los Angeles.
Between 1968 and 1985, Nichols taught at Dartmouth College, and was Edward Tuck Professor of French from 1984.
Nichols left UPenn for Johns Hopkins University in 1992, holding the James M. Beall Professorship of French and Humanities until retirement in 2010.