This study examined the impact of agricultural development on Nigeria’s economic growth (1980-2013) while the specific objectives were to: ascertain if there is long run relationship existing between agricultural development and economic growth in Nigeria and evaluate if there exist any significant causal relationship between agricultural development and economic growth in Nigeria. The study employed ex-post facto research design using Nigeria’s data obtained from CBN (1980-2013). The empirical results were on Augmented Dickey Fuller test. In the second step, Johansen cointegration test was conducted. The presence of long run equilibrium found led to the use of Error Correction Mechanism (ECM).  It was found that there is significant long run association existed between agricultural development and economic growth within the period under study. Granger Causality test conducted indicated the presence of one way causality running from agricultural development to economic growth. More so, it showed that government expenditure on agriculture preceded economic growth within the sampled period of study. In order to sustain long run positive relationship between agricultural development and economic growth in Nigeria, policies which will gear up increase in agricultural output must be maintained. A general review and proper implementation of budgetary allocation of the government expenditure on agriculture must be undertaken. More so, government should always consider agricultural sector development as the hallmark for her expenditure in the sector. In so doing, her spending on the economy will promote growth.

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