Are liberalism and perfectionism compatible? In this study Steven Wall presents and defends a perfectionist account of political morality that takes issue with many currently fashionable liberal ideas but retains the strong liberal commitment to the ideal of personal autonomy. He begins by critically discussing the most influential version of anti-perfectionist liberalism, examining the main arguments that have been offered in its defense. He then clarifies the ideal of personal autonomy, presents an account of its value and shows that a strong commitment to personal autonomy is fully compatible with an endorsement of perfectionist political action designed to promote valuable pursuits and discourage base ones. His study is a timely and original contribution to one of the most important contemporary debates in political philosophy.