Shannon Matilda Wells Lucid (born January 14, 1943) is an American biochemist and a retired NASA astronaut.
At one time, she held the record for the longest duration stay in space by an American, as well as by a woman.
She has flown in space five times including a prolonged mission aboard the Mir space station in 1996; she is the only American woman to have served aboard Mir.
In 2002, Discover magazine recognized Lucid as one of the 50 most important women in science.