This research work focused on the effect of working capital management on the corporate profitability of manufacturing firms using Dangote Cement Plc. as a case study. Two hypotheses were formulated and tested using annual reports sourced from Dangote Cement Plc. web database spanning from 2007 to 2016. Ordinary least squares regression method was employed using a multiple regression model and results showed that efficient working capital management has positive significant influence on return on assets and that efficient working capital management has positive significant influence on net profit margin. It was however recommended that firms should improve their working capital policies in order to enhance corporate profitability and that there should be periodical appraisal of investments in working capital using capital investment models, determining ahead the viability of such investments.