Is it womens or women’s?
It’s “women’s,” with an apostrophe.
The word “women” is already plural, so you don’t add an “s” unless you are forming a possessive noun (in which case you would also add the apostrophe).
For example, it’s “Happy International Women’s Day,” not “Happy International Womens Day.” Keep the distinction clear by imagining that this day belongs to women.
Use QuillBot’s free Grammar Checker to avoid spelling mistakes like this one.