Augustus Brown Reed Sprague (March 7, 1827 – May 17, 1910) was an American businessman, politician, and military figure who served as the mayor of Worcester, Massachusetts, the sheriff of Worcester County, Massachusetts, and as a Union Army officer during the American Civil War.

[3][4] At the start of the American Civil War, Sprague enlisted in the Union Army on April 17, 1861, and Sprague was mustered into United States Service as a captain in the Third Massachusetts Rifles on April 19, 1861.

[5] Sprague served with the 25th Massachusetts Infantry in Burnside's North Carolina Expedition.

He was commissioned lieutenant colonel of the 2nd Massachusetts Heavy Artillery Regiment on February 1, 1864, and was mustered out in September 1865.

Sprague was also a member of the Grand Army of the Republic and served as commander of the Department of Massachusetts in 1868.

He was also descendant from Mayflower passengers Stephen Hopkins, John Alden and Priscilla Mullins.