G. William Diamond (born 1945) is an American Democratic politician, educator, small business owner, legislator and former Maine Secretary of State.

[4][5][6] Diamond first ran for Maine House District 23 in 1976, winning the Democratic primary as a write-in candidate and defeating Republican Barbara Strout 51%-49% in the general election.

[8][9][10][11] In 1982, Diamond defeated Republican David Huber 56%-44% in the general election to represent Maine Senate District 6.

[16] Diamond entered the race for Maine's 1st congressional district in 1994 but lost the Democratic primary election.

In 2014, Diamond again sought the Senate District 26 seat, ran unopposed in the Democratic primary and defeated Republican Kaile Warren 63%-37% in the general election.

[21][2] In 2012, Diamond published The Evil and the Innocent, a compilation of true crime stories about perpetrators and victims of child sexual abuse.