Morris Sawyer Tremaine (February 27, 1871 – October 12, 1941) was an American businessman and Democratic Party politician from Buffalo, New York.

Tremaine lived with his family at Fort Dodge and in Cobourg, Ontario, Canada before they settled in Buffalo, New York when he was 10 years old.

Tremaine attended both public and private schools in Buffalo, and graduated from Upper Canada College in Toronto at the age of 17.

He started work at age 17 as a tally boy on the Buffalo docks for the Holland, Graves & Montgomery wholesale lumber firm.

In 1914, he joined the J. G. Wilson Corporation, makers of rolling steel doors and folding partitions, and he was the company's president when he retired in 1930.