Adam M. Duncan (1927 - 2000) was a member of the Utah state legislature and a prominent attorney and civil rights leader in Utah.
Duncan was born in Salt Lake City. As a young man Duncan served a mission for the Church of Jesus Christ of Latter-day Saints in South Africa. He received his law degree from the University of Utah. He was a trial attorney. He was a founder of the Utah branches of the ACLU and the NAACP.