What Is a Woman? is a 2022 American documentary film about gender and transgender issues, directed by Justin Folk and presented by conservative political commentator Matt Walsh. The film was released by conservative website The Daily Wire. The title, "What is a woman?", has become a widespread rhetorical question in anti-trans discourse. In the film, Walsh asks various people "What is a woman?", attempting to prove that their definition of womanhood is circular. Walsh said he made the film in opposition to "gender ideology". It is described in many sources as anti-trans or transphobic. The film was released to subscribers of The Daily Wire on June 1, 2022, coinciding with the start of Pride Month.

The film received mixed reviews. Walsh's approach garnered praise from conservative commentators, while drawing criticism from other sources, including advocates of transgender healthcare. According to transgender activists and others who appeared in the film, Walsh had invited individuals to participate in the film under false pretenses. Walsh's tour to showcase the film at college campuses sparked protests. In June 2023, during the subsequent Pride Month, the film gained further attention when Elon Musk promoted it on Twitter.