This study seeks to describe and analyze the challenges occasioned by brain drain or human capital flight of librarians on service delivery in Nigerian Universities. The research adopted a descriptive survey design. A purposive sampling technique was used to select two geopolitical zones (South-South and South-West) from the six geopolitical zones of Nigeria. https://www.spidertattooz.com/OPI-GelColor-The-Color-That-Keeps-On-Giving-0-5-oz-HPJ07-p22791/