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Abstract
This study examined the impact of public health expenditure on life expectancy in Nigeria. Data was sourced from CBN and World Bank Development Index for the period of 1985-2022. The study used Descriptive Statistics, ARDL model and Granger causality test for data analysis. The study found a long-run relationship between public health expenditure and life expectancy in Nigeria. The findings also revealed that there is non-causal relationship between public health expenditure and life expectancy in Nigeria. The study recommends that Nigerian government should intensify efforts in ensuring the increase of public health expenditure based on the 2001 Abuja declaration standard of 15% of the annual national budget in other to enhance health conditions of her citizens, ensure efficient allocation of resources to targeted public health sector, focusing on preventive measures, disease control, and health education. Key words: Life expectancy, under-five mortality, public health expenditure