John Reagan Sr.
- Born in Boston, Massachusetts on August 15, 1845
- Served in the Civil War
- Career in U.S. Army
- Married Bertha Hazelton on November 4, 1896 in Omaha, Nebraska
- Was a guard at the Trans-Mississippi Exposition in 1898
- Had one child, John Reagan Jr.
- Died on September 4, 1916 in Omaha, Nebraska
- Buried at Forest Lawn Cemetery in Omaha, Nebraska