Simon Moulton Hamlin (August 10, 1866 – July 27, 1939) was an American educator, businessman and politician who served as a U.S. Representative from Maine for one term from 1935 to 1937.
He taught school and, in 1900, graduated from Bowdoin CollegeinBrunswick, Maine.
He served as superintendent of the South Portland and Cape Elizabeth schools from 1901 to 1925 and as city clerk of South Portland, Maine in 1913.
He engaged in the real estate business at South Portland in 1925.
He was also interested in farming.
He served as member of the board of registration 1926–1932. He served as mayor in 1933 and 1934.
Hamlin was elected as a Democrat to the Seventy-fourth Congress (January 3, 1935 - January 3, 1937). He served as chairman of the Committee on Memorials (Seventy-fourth Congress). He was an unsuccessful candidate for reelection in 1936 to the Seventy-fifth Congress.
He resumed the real estate business and farming in South Portland, Maine, until his death there July 27, 1939. He was interred in Hamlin Cemetery, Standish (Richville), Maine.
