Defending Kant’s Antinomy of Practical Reason Christopher Benzenberg University of Cambridge This is a penultimate draft. Please refer to the published version. Abstract — This paper defends Kant’s ‘Antinomy of Practical Reason’ (APR) against the objection that it fails to meet the standards of a strict Kantian antinomy. Critics claim that the APR cannot be a true antinomy because its thesis and antithesis do not contradict each other logically, unlike the ‘Antinomies of Theoretical Reason’ (ATRs). In response to this objection, it is argued that the theses and antitheses of the ATRs do not contradict each other logically either; they only contradict each other relatively. It is then shown that the thesis and antithesis of the APR, properly understood, also contradict each other relatively, thus satisfying the same standard as the ATRs. This paper offers broader insights into the structure of antinomical conflict within Kant’s Critical philosophy.