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.

Hamlin was born in Standish (Richville), Cumberland County, Maine, Hamlin attended the public schools, Gorham Normal School, and Bridgton Academy.

He taught school and, in 1900, graduated from Bowdoin College in Brunswick, Maine.

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.