Levi Thomas Griffin (May 23, 1837 – March 17, 1906) was a politician from the U.S. state of Michigan.
Griffin, born in Clinton, Oneida County, New York, was named for his maternal grandfather, Levi Thomas of Utica, New York. He moved with his parents to Rochester, Michigan in the fall of 1847. He graduated from the University of Michigan Law School at Ann Arbor in 1857. While studying for the bar in Detroit, he was employed as a court deputy in the Federal District Court through the assistance of a fellow University of Michigan alumnus, William A. Moore, who was then Assistant United States District Attorney. Griffin was admitted to the bar in May 1858 and in November moved to Grand Rapids, where he begin to practice in the office of prominent Western Michigan lawyer Lucius Patterson. After a fire destroyed the offices in April 1860, along with most of the records of Kent County, Griffin returned to Detroit where he was employed in the law offices of Moore until January 1862, when they formed a partnership named "Moore and Griffin".
Griffin was commissioned by Governor Austin Blair, as Second Lieutenant in Company C of the Fourth Michigan Cavalry, and was mustered into service on August 13, 1862. He was promoted to full Second Lieutenant on December 18 and assigned to duty as Brigade Inspector. On February 1, 1863, he was promoted to First Lieutenant, and then on April 15 as regimental Adjutant. On February 24, 1864, he was commissioned as Captain, and on September 15 was assigned as Acting Assistant Adjutant General of the Second Cavalry Division. On December 25, he became Acting Assistant Adjutant General of the Cavalry Corps of the Military Division of the Mississippi, with Major General James H. Wilson commanding. He was mustered out of service on July 1, 1865 and was subsequently brevetted major of United States Volunteers by President Andrew Johnson on March 13, 1866 for gallant and meritorious service during the American Civil War.