Joseph Henry Engle was an American pilot, aeronautical engineer, and NASA astronaut. He was the commander of two Space Shuttle missions including STS-2 in 1981, the program's second orbital flight. He also flew two flights in the Shuttle program's 1977 Approach and Landing Tests. Engle was one of twelve pilots who flew the North American X-15, an experimental spaceplane jointly operated by the Air Force and NASA.