Merton Elmer Lewis (December 10, 1861 – May 2, 1937) was an American lawyer and politician.
He was born on December 10, 1861, in Webster, Monroe County, New York, the son of Charles Chadwick Lewis (b. 1826) and Rhoda Ann (Willard) Lewis. He graduated from Webster Union School, then studied law with James B. Perkins at Rochester. He was admitted to the bar in 1887, and commenced practice in Rochester. On January 2, 1886, he married Adeline Louise Moody (1866-1894).
He was delegate to the New York State Constitutional Convention of 1894. He was an alderman of Rochester from 1891 on, and as President of the Common Council since 1894 became Acting Mayor of Rochester after the resignation of George W. Aldridge in 1895.
He was a member of the New York State Assembly (Monroe Co., 1st D.) in 1897, 1899, 1900 and 1901; and of the New York State Senate (43rd D.) from 1902 to 1906, sitting in the 125th, 126th, 127th, 128th and 129th New York State Legislatures.
At the New York state election, 1906, he ran for New York State Comptroller, but except for Governor Charles Evans Hughes, the whole Republican ticket was narrowly defeated by the ticket nominated by the Democratic Party and the Independence League.