Crawford Hallock Greenewalt (August 16, 1902 – September 28, 1993) was an American chemical engineer who was president of the DuPont Company from 1948 to 1962, and chairman from 1962 to 1967.
In 1922, he earned a Bachelor of Science degree in chemical engineering from Massachusetts Institute of Technology, where he joined Theta Chi fraternity.
While at DuPont, Greenewalt was a key figure in their development of nylon and their nuclear power program.
His widely varied interests included ornithology and high-speed photography via his friend Harold E. "Doc" Edgerton.
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