John Donovan "Jack" Gardner (born 27 September 1954) is a retired lieutenant general in the United States Army. He is the former deputy commander of the United States European Command in Stuttgart, Germany. During his career he served in Europe, Asia, Latin America, Bosnia, Iraq and numerous locations throughout the United States. He currently serves as the director of the 21st Century Jobskills Project, a nonprofit organization focused on assisting public school students in transitioning to living wage jobs. Gardner is a native of Columbus, Ohio.