Helen Blair Barlett (born December 14, 1901, Sharpsville, Pennsylvania; died August 25, 1969) was an American geologist, best known for her contribution to the design of spark plug insulators.
She received her Bachelor of Science degree in 1927 in geology from Ohio Wesleyan University.
Following up her degree in geology, she attended Ohio State University granting her a PhD degree in mineralogy in 1931.
Upon receiving her PhD, she joined the AC Ceramic Research Department as a mineralogist-geologist, where she worked until her retirement in 1966.
She was a member of the Mineralogical Society of America, as well as a fellow of the American Ceramic Society, being one of the few female members at the time.
She was also a member of the American Chemical Society and the American Association for the Advancement of Science.