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Males and females share many traits that have a common genetic basis; however, selection on these traits often differs between the sexes, leading to sexual conflict^,. Under such sexual antagonism, theory predicts the evolution of genetic architectures that resolve this sexual conflict^,,,. Yet, despite intense theoretical and empirical interest, the specific loci underlying sexually antagonistic phenotypes have rarely been identified, limiting our understanding of how sexual conflict impacts genome evolution^, and the maintenance of genetic diversity^,. Here we identify a large effect locus controlling age at maturity in Atlantic salmon (Salmo salar), an important fitness trait in which selection favours earlier maturation in males than females, and show it is a clear example of sex-dependent dominance that reduces intralocus sexual conflict and maintains adaptive variation in wild populations. Using high-density single …