This study was motivated by the conflict in theoretical and empirical literature on the comparative effect of fiscal and monetary policies on economic growth. The focus is on which of the two policies has a greater effect on promoting economic growth. Likewise, this study examined the relative impact of fiscal and monetary policy on economic growth in Nigeria from the year 1986 to 2020. The Autoregressive Distributed Lag (ARDL) method was employed as the estimation technique. The findings of this study showed that monetary policy has a greater impact on promoting economic growth in Nigeria. Interestingly, government expenditure was found to be negatively significant, and interest rates were deemed insignificant to the Nigerian economy. The study emphasizes the importance of institutional discipline and policy coordination between the finance ministry and the apex bank to achieve an optimal balance between fiscal and monetary policies.