"Womyn" is one of a number of alternative spellings of the word "women" used by some feminist writers. There are many alternative spellings, including "wimmin", "womban", "wom!n". Writers who use alternative spellings see them as an expression of female independence and a repudiation of traditions that define females by reference to a male norm.

In Old English sources, the word "man" was gender-neutral, with a meaning similar to the modern English usage of "one" as an indefinite pronoun. The words wer and wyf were used to specify a man or woman where necessary, respectively. Combining them into wer-man or wyf-man expressed the concept of "any man" or "any woman." Over time wer-man was simplified to man while wyf-man developed into woman. Feminist writers have suggested that the less prejudicial usage of the Old English sources reflects more egalitarian notions of gender at the time although this is not supported by historical or etymological studies.

"Womyn" appeared as a regular spelling of "woman" in the Scots poetry of James Hogg. Its usage as a feminist spelling of "women" (with "womon" as the singular form) first appeared in print in 1975 referring to the first Michigan Womyn's Music Festival, an annual art festival that admits only womyn-born womyn.