Katherine Vandam Bornstein is an American author, playwright, performance artist, actor, and gender theorist. In 1986, Bornstein started identifying as gender non-conforming and has stated "I don't call myself a woman, and I know I'm not a man" after having been assigned male at birth and receiving sex reassignment surgery. Bornstein now identifies as non-binary and uses the pronouns they/them and she/her. Bornstein has also written about having anorexia, being a survivor of PTSD and being diagnosed with borderline personality disorder.

Herculine Adélaïde Barbin, later known as Abel Barbin, was a French intersex person who was assigned female at birth and raised in a convent, but was later reclassified as male by a court of law, after an affair and physical examination. She is known for her memoir, Herculine Barbin, which was studied by Michel Foucault. Her birthday is marked as Intersex Day of Remembrance.