The paper aimed at assessing the extent to which government sectoral expenditure affected the level of economic growth in Nigeria. The period of 20 years was covered. The researcher employed multiple regression, Durbin-Watson and correlation analysis. Descriptive statistics was also employed to graphically look at the nature and trend of the data over the period in order to draw useful inference about the parameters. GDP was used to proxy economic growth while other explanatory variables are Agriculture, Industry, Construction, Services and trade. The result of the findings shows that parameters used for the analysis contributed to economic growth except trade. The paper therefore concluded that government sectoral expenditure positively and significantly contributed to economic growth of Nigeria. The recommendation is that efforts should be geared towards strengthening the public sector in Nigeria, insuring transparency and accountability.