Rachel Jane "Jennie" Nicol (1845–1881) was a founder of Pi Beta Phi and a physician. In 1867, she cofounded I.C. Sorosis at Monmouth College in Illinois, the first secret collegiate society for women patterned after men's fraternities, which later adopted the Greek name Pi Beta Phi (ΠΒΦ).

Pi Beta Phi (ΠΒΦ), often known simply as Pi Phi, is an international women's fraternity founded at Monmouth College, in Monmouth, Illinois on April 28, 1867, as I. C. Sorosis, the first national secret college society of women to be modeled after the men's Greek-letter fraternity.