Barbara Radding Morgan (born November 28, 1951) is an American teacher and a former NASA astronaut. She participated in the Teacher in Space program as backup to Christa McAuliffe for the 1986 ill-fated STS-51-L mission of the Space Shuttle Challenger. She then trained as a Mission Specialist, and flew on STS-118 in August 2007. Leading up to STS-118, Morgan joined Sally Ride and Shannon Lucid as female astronauts widely covered by the media.