Greenfield Quarles (April 1, 1847 - January 14, 1921) was one of the founders of Sigma Nu fraternity.
Born in Christian County, Kentucky, April 1, 1847. Greenfield Quarles entered the Confederate service at the age of 16 as an aide to his uncle General William A. Quarles. He served until he was captured during the Second Battle of Franklin on November 30, 1864. Eventually Quarles was exchanged in May 1865 and returned to the South.
In 1866 Greenfield Quarles entered the Virginia Military Institute (VMI) and soon met and became a constructive force in James Frank Hopkins's vision of Sigma Nu.
Having been in prison, Quarles was mature and looked up to by other cadets at VMI. Greenfield Quarles eventually became a judge in Helena, Arkansas. Quarles was important in the early expansion of Sigma Nu and granted the charter to Gamma Upsilon chapter (Arkansas). He also attended the Grand Chapters in 1902, 1908, and 1921.
In 1921 he attended special school in the Foote Hills of South Dakota where he considered becoming a man of the cloth. This lasted only months before he returned to attend the Grand Chapter of 1921
On January 14, 1921 Greenfield Quarles entered eternal chapter and was buried in his hometown of Helena, Arkansas.