Jack L. Tilley (born December 3, 1948) is an American businessman and retired United States Army soldier.

Tilley was born in Vancouver, Washington, on December 3, 1948, and enlisted in the United States Army under the "Buddy Program" with his friend Barney Boykin.

Other assignments he held as command sergeant major were 1st Battalion, 10th Cavalry, Fort Knox, 194th Armored Brigade, 1st Armored Division, Bad Kreuznach, Germany, and United States Army Space and Missile Defense Command, Arlington, Virginia.

Tilley retired from the army in January 2004 and served as the Chief Executive of JTilley, Inc., a services company based in Tampa, Florida, that specializes in placing military leaders into corporate America.

Tilley is the author of the book Soldier for Life: Lessons from the 12th Sergeant Major of the Army Jack L.