Across languages, pronouns encode a range of social information, such as the speaker’s age relative to the addressee (e.g., the Hindi pronoun aap) or the referent’s gender (e.g., the English pronoun he). The assumptions underlying certain pronouns are uncontroversial (e.g., people are different ages). Other pronouns, however, pertain to aspects of the social world that are currently being fiercely debated (e.g., whether gender is binary and apparent). While prior research has explored people’s beliefs about social groups and identities, less is known about how people reason about the intersection of identity and language: Which social identities (if any) do lay speakers think that pronouns should encode, and why do they think this? We found that U.S. English-speaking participants (NTotal = 1,120) endorsed gender pronouns more than various other types, including pronouns based on other identities (e.g., age, race) and identity-neutral pronouns (Studies 1–3). In addition, participants’ ideological beliefs about social groups as distinct (essentialism) and hierarchal (social dominance orientation) related to (Study 2; preregistered) and causally influenced (Study 3; preregistered) their endorsement of both gender and race pronouns. The present findings address an underexplored set of lay beliefs about social identities and language. Despite recent calls for greater use of identity-neutral pronouns, English-speaking participants in this sample overwhelmingly endorsed the use of gender pronouns, in part because of their social ideologies.