Katherine Megan McArthur (born August 30, 1971) is an American oceanographer and a National Aeronautics and Space Administration (NASA) astronaut. She has served as a Capsule Communicator (CAPCOM) for both the space shuttle and space station. Megan McArthur has flown one space shuttle mission, STS-125, where she served as Mission Specialist in repairing the Hubble Space Telescope. McArthur has served in a number of positions including working in the Shuttle Avionics Laboratory (SAIL). McArthur has logged almost 13 days in space. She is currently assigned as the Commander of the NASA SpaceX Crew-2 mission to the ISS, scheduled to launch in April 2021.