Leonard Wright Colby (August 5, 1846 – November 18, 1924), who hailed from the U.S. state of Ohio, was a leader of the first Nebraska National Guard, American Indian Wars veteran, state senator of Nebraska and United States Assistant Attorney General. As a teenager, he fought in the American Civil War. During his career, he commanded both Nebraska and U.S. troops. He served as commander of the Nebraska National Guard.
Colby was born in Cherry Valley Township, Ashtabula County, Ohio in 1846. The fifth of seven children, his parents were Rowel and Abigail (Livingston) Colby. His parents were from Grafton County, New Hampshire. When he was about four years old his parents removed to a farm five miles from Freeport, Illinois.
As a teenager, he enlisted in the 8th Illinois Volunteer Infantry Regiment and served the Union Army in the American Civil War. Wounded at the Battle of Fort Blakely in 1865, in almost the last battle of the Civil war, and was recommended for promotion and commission for gallant and meritorious services in the charge at Fort Blakely and the siege of Mobile, Alabama, where he captured a Confederate flag; he was discharged that year. After his discharge from the Union army, in 1865, he with about fifty others from his regiment enlisted with the forces of Maximilian, serving with the rank of captain for several months, until his resignation, in December, 1865.