Gary Plummer is an American politician from Maine. Plummer, a Republican from Windham, Maine, served as a member of the Maine Senate, where he represented part of Cumberland County. Plummer was first elected to the Maine House in 2004 and was subsequently re-elected in 2006, 2008 and 2010. He was unable to run for re-election to the Maine House in 2012 and sought to replace William Diamond in Maine Senate (District 12). He did not seek re-election in 2014 and was replaced by Diamond.