A paper by Dev Patel and me for CGD. This analysis examines the relationship between legal reform and social norms surrounding homosexuality. We document three main findings. First, about a fifth of the variation in individual preferences can be explained at a country level. Second, using a difference-in-differences strategy, legalizing homosexuality improves how individuals view the tone of their communities. Third, we provide further evidence supporting a legal origins argument by examining former colonies. Countries that were colonized by the British Empire have significantly worse legal rights for samesex couples than those under other colonial powers. We conclude that adopting legal reform can improve societal attitudes.