<p>Gaslighting has been analyzed as an interpersonal practice that undermines its target’s self-trust, yet existing accounts remain fragmented. Some emphasize emotion or intention; others restrict the phenomenon to epistemic cases. I propose a unified <i>Norm-Relative Success Account</i>, on which gaslighting occurs when a person is manipulated into explicitly judging or tacitly accepting her defectiveness relative to a competence structured by contextually salient norms. The account is anti-intentionalist in scope rather than exclusionary: it does not require characteristic intentions for gaslighting, but it accommodates intentionalist cases as well, while identifying gaslighting’s distinctive harm through a success condition rather than through intentions or downstream consequences. By appealing to correctness under norms rather than truth, the framework generalizes beyond epistemic cases and applies across a wide range of norm-governed domains. It thereby yields a principled taxonomy of varieties—including moral, aesthetic, methodological, and decorous gaslighting—without conceptual creep or fragmentation. More generally, the account contributes to debates about normativity, competence, and manipulative undermining of agency by clarifying conditions under which self-trust, and thus agential standing itself, can be corroded.</p>