This study explored the impact of financial deepening on manufacturing sector in Nigeria using time series data covering 1990 to 2023.Maunfacturing sector performance is expressed by growth in manufacturing with financial access, financial depth and financial efficiency serving as indices for financial deepening. The study adopted the ex-post facto research design because of its unique attribute of being able to deals with outcome of events that have already occurred. The technique of data analysis is auto regressive distributed lag (ARDL).The findings showed that financial access and financial depth are positive and significant to growth in the manufacturing sector, while financial efficiency was negative and significant to growth in the sector. The study concludes that financial deepening contributed to growth in the manufacturing sector within the period reviewed. It therefore recommends that monetary authorities especially the CBN should implement policies that promote and increase financial depth in the society. Financial institutions such as commercial banks and micro finance banks should be encouraged to increase lending to both SMEs and manufacturing firms so   as to boost productivity in the Nigerian economy.

Keywords: Financial deepening, manufacturing sector; Manufacturing sector; and ARDL