This research investigated the effect of corporate governance on earnings management of quoted deposit money banks in Nigeria. Research design that is used in this study is the descriptive research and longitudinal method specifically the cohort study. Therefore, from our findings it was drawn that; There is a substantial correlation involving board size composition and earnings management of quoted deposit money banks in Nigeria. There is a substantial correlation involving corporate monitoring quality and earning management of quoted deposit money banks in Nigeria. There is no substantial correlation involving Leadership Structure and earning management of quoted deposit money banks in Nigeria. Thus, the researcher concludes that there is a substantial correlation involving corporate governance and earning management of quoted deposit money banks in Nigeria.