We addressed phenotypic and genetic research questions regarding nostalgia and self-enhancement. At the phenotypic level (178 university students; Study 1), we found that nostalgia was moderately associated with self-enhancement. At the genotypic level (232 twin pairs; Study 2), we found that nostalgia, self-enhancement, and their relation were largely heritable. Our findings shed light on two heavily investigated traits and open up exciting research directions.