Roger Keith Crouch (born September 12, 1940) is an American scientist and astronaut who flew as a payload specialist on two NASA Space Shuttle missions in 1997.

In addition, he helped organize and has served as co-chair for Microgravity Science Working Groups between NASA and space agencies from the European Union, France, Germany, Japan, and Russia.

He was the founding co-chair of the International Microgravity Science Strategic Planning Group consisting of these space agencies plus Canada.

He has done research in various techniques and types of semiconductor crystal growth, electric and optical properties of materials, electronic devices for remote sensing and flat panel displays, and heat shield protection for atmospheric reentry of space vehicles.

STS-83, the Microgravity Science Laboratory (MSL-1) Spacelab mission, was cut short because of problems with one of the Shuttle’s fuel cell power units.