Janet Gretchen Osteryoung (March 1, 1939 – September 21, 2021) was an American chemist who was the director of the Chemistry Division of the National Science Foundation from 1994 to 2001. Her research furthered the development of electroanalysis and especially that of square wave voltammetry. She was elected a Fellow of the American Association for the Advancement of Science in 1984 and awarded the Garvan–Olin Medal in 1987.