The term cissexual is usually defined as “non‐transsexual,” and the term cisgender is usually defined as “non‐transgender.” Cissexual and cisgender disrupt the marked–unmarked relations between transsexuality and non‐transsexuality and between transgender and non‐transgender. The prefixes cis‐ and trans‐ are antonymic. Cissexual and cisgender entered into circulation in 1991 and 1994, respectively. The variety of the terms’ definitions and deployments raises complicated questions about sex, gender, sexuality, and the politics of naming. The terms’ alternative forms include cis, cis‐, and cisgendered. Related concepts include the cisgender gaze, cisgenderism, cisnormativity, cisplaining, cissexism, cissexual assumption, and cissexual gender entitlement. The most generative related concept is cissexual/cisgender (cis) privilege. This concept was popularized by the “Cis Privilege Checklist.” The reality of cis privilege is denied by members of a radical feminist subculture. Perhaps the most promising direction for future scholarship on cissexuality and cisgender is intersectional analysis of cis privilege.