Ronald McNair, American physicist and astronaut (b. 1950)
Ronald Erwin McNair (October 21, 1950 – January 28, 1986) was an American NASA astronaut and physicist. He died during the launch of the Space Shuttle Challenger on mission STS-51-L, in which he was serving as one of three mission specialists in a crew of seven.

Prior to the Challenger disaster, he flew as a mission specialist on STS-41-B aboard Challenger from February 3 to February 11, 1984, becoming the second African American and the first Baháʼí to fly in space.