Harold L. "Trey" Stewart III (born February 7, 1994) is an American politician from Maine. Stewart, a Republican from Presque Isle, has represented District 2 in the Maine Senate since 2020 when he replaced Democrat Michael E. Carpenter. From 2016 to 2020, Stewart served in the Maine House of Representatives. During the 2019-20 session, he served as Assistant Minority Leader. Following his re-election in November 2022, Stewart was named Senate Minority Leader. Fellow Aroostook County Senator Troy Jackson was re-elected as Senate President.