| William Caspar Graustein | |
| Birth Date: | 15 November 1888 |
| Birth Place: | Cambridge, Massachusetts |
| Death Place: | Cambridge, Massachusetts |
| Nationality: | American |
| Fields: | Mathematics |
| Workplaces: | Harvard University |
| Alma Mater: | Harvard University |
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| Spouse: | Mary Florence (nee Curtis) |
William Caspar Graustein (15 November 1888 – 22 January 1941) was an American mathematician. He graduated magna cum laude from Harvard University in 1910[1] and later became an instructor at Harvard University. In 1921, he married Mary Curtis Graustein (1884 - 1972), who was the first American woman to earn a mathematics Ph.D. (1917) from Radcliffe College.[2]
He died in an automobile accident, at the age of 52. At the time, Graustein was professor of mathematics and assistant dean at Harvard.
Some of his books and papers are:[3]