Dwight May (September 8, 1822 – January 28, 1880) was a politician from the U. S. state of Michigan who also served as officer in the Union Army during the American Civil War.
May was born in Sandisfield, Massachusetts to Rockwell and Celestia (Underwood) May and moved to Richland, Michigan at the approximate age of twelve.
After graduating he entered the law office of Lathrop & Duffield in Detroit and in July 1850 was admitted to the bar at the Michigan Supreme Court.
On October 8, 1862, he was commissioned lieutenant colonel of the 25th Michigan infantry at Bolivar, Tennessee, and served through the rest of the American Civil War.
In June 1865 he succeeded Colonel W. H. Graves in command of the 12th Michigan Infantry Regiment and was soon afterwards brevetted brigadier general and mustered out of the service on March 6, 1866.