Leigh Richmond Brewer (January 20, 1839 - August 28, 1916) was a bishop of Montana in The Episcopal Church.

He was ordained a priest by Bishop Arthur Cleveland Coxe of Western New York on June 16, 1867.

He became rector of Grace Church in Carthage, New York.

After 6 years he became rector of Trinity Church in Watertown, New York.

He was consecrated in Trinity Church Watertown on December 8, 1880, by Bishop Frederic Dan Huntington of Central New York, together with Bishop Daniel S. Tuttle of Utah, William Bissell of Vermont, Benjamin Wistar Morris of Oregon and Benjamin Henry Paddock of Massachusetts.