John Elias Baldacci (born January 30, 1955) is an American politician who has served as the Governor of the U.S. state of Maine since 2003. A Democrat, he also served as a member of the United States House of Representatives from 1995 to 2003. On May 6, 2009, Governor Baldacci became the second Governor in the United States to sign a gay marriage bill into law, after M. Jodi Rell of Connecticut, and the first to do so without a court order.

Born in Bangor, Maine, Baldacci grew up with seven siblings in a Lebanese-Italian family. As a child, he worked in the family business, Momma Baldacci's restaurant in Bangor. A graduate of Bangor High School, he received a B.S. degree in history from the University of Maine at Orono.

Baldacci was first elected to public office in 1978 at the age of 23, when he served on the Bangor City Council. He continued in politics, winning election to the Maine Senate in 1982. Baldacci served as a State Senator for 12 years.