Recent research demonstrates a rise in female-related violence. Associations between mental health and violence are well established, but the gender-specific impact remains under-evaluated. We explored how gender and well-being interact to affect likelihood of violence in a Northern Irish youth sample. A survey conducted as part of a wider evaluation asked respondents (N = 125) their gender, self-reported well-being, and likelihood of violence. Results showed a moderating effect of gender. Higher well-being was linked to higher likelihood for violence for females, with no effects for males. This supports previous research and implies a gender-neutral approach may not reduce the risk of violence.