This paper examines the implications of Girl-child to nation building in the 21st century in Nigeria. The paper began by pointing out the wrong notions that many Nigerians have particularly the rural dwellers about women being consider as properties for man and objects for their pleasure and how this notion restrains them from training their girl-children in schools. The paper further examined the concept of girl-child education to be all inclusive, some hindrances to effective girlchild education such as economic factors, sexual violence and abuse, political factors, the school environmental factors and socio-cultural and religious factors were highlighted. Included in the paper also was the implications that effective girl-child education would have on nation building such as povertyreducing effects, improves health and nutrition, reduces inequality, reduces womenâ€™s fertility rates, lowers infant and mortality rates and increases womenâ€™s labour force participation rates and earnings. The paper finally recommended among others that government at all levels should give more attention to girl-child education, well to do individuals can contribute to girl-child education by giving them scholarship to study in higher institution, provision of school facilities and equipment that can ease their learning effectively as it contribute to nation building and the need to create more awareness for parents on sexual violence and abuse and this can be through radio and newspaper jingles and advertisement as well as periodical seminars and conferences.