Nelson Madore (born c. 1943) is a Maine politician and academic. Madore was the Mayor of Waterville, Maine from 1999–2004 and professor of history, geography and government at Thomas College in Waterville. He retired from Thomas College after forty years in 2009.
Madore earned his BA in history and government in 1965 from the University of Maine and his MA in history from Maine two years later in 1967 and taught for two years at Penquis Valley High School in Milo, Maine. He began teaching courses at Thomas in 1969. He earned an EdD in Educational Administration from Vanderbilt University in 1982.
Madore served on various levels of city government in Waterville; these positions included 18 years on the Waterville Board of Education including 12 as chair and as the city's mayor from 1999-2004. He was replaced as Mayor by businessman Paul LePage.
In 2006, Madore was a candidate to be the Democratic nominee for County Commissioner of Kennebec County but lost to Zachary Matthews.