The 1986 Maryland gubernatorial election was held on November 4, 1986. Democratic nominee William Donald Schaefer defeated Republican nominee Thomas J. Mooney with 82.37% of the vote.
As of 2022, this is the last time a candidate from either party carried every county in a gubernatorial election, and the last time the Democratic candidate won a majority of counties in a gubernatorial election. He is also the last Democrat to win the following counties: Garrett, Washington, Frederick, Carroll, Anne Arundel, Kent, Queen Anne's, Talbot, Caroline, Dorchester, Wicomico, and Somerset.