Marcellus Lovejoy Stearns (April 29, 1839 – December 8, 1891) was an American politician who served as the 11th Governor of Florida from 1874 to 1877 during the Reconstruction Era.

He was assigned to Quincy in Gadsden County in the Florida Panhandle, where he remained after his discharge from the military.

He succeeded to the governorship on March 18, 1874, at age 34 when Governor Ossian B. Hart died of pneumonia.

After leaving office on January 2, 1877, he was appointed U. S. Commissioner in Hot Springs, Arkansas, a post that he held until 1880.

After he left office on January 2, 1877, there was no Republican governor of Florida until 1967, when Claude Kirk was inaugurated.