This article attends to the absences and silences of sexual identity and knowledge in science communication scholarship. It locates identitarian debates within this scholarship and utilises queer theory to encourage a shift towards a post-identitarian approach to conceptualising sex (as a social act) in science communication. In this way, this article advocates for a queer science communication that critically examines normative identities, practices, institutions, and policies, and makes room for subjugated knowledges within science communication theory and practice.