Building upon recent calls for the integration of abolition into psychology, we develop and validate a measure of Abolitionist Ideology. In two studies with abolitionist leaning (N = 201, abolitionist‐identifying n = 58) and nationally representative (N = 350) samples, we identify and confirm a three‐factor, 26‐item measure including subscales of Alternatives to State Violence, Revolutionary Abolitionism, and Abolitionist Identity. The Abolitionist Ideology Scale demonstrates convergent validity with measures including support for Black Lives Matter, critical consciousness, openness to experience, radical imagination, and attribution of violence to the state. The scale demonstrates divergent validity from measures including social dominance orientation (SDO) and political conservatism. Finally, the scale predicted activism tenacity above and beyond a related measure of carceral system justification. The Abolitionist Ideology Scale demonstrates initial reliability and validity and will be useful for those aiming to engage abolition in liberatory theory, research, and practice.