This study examines The Role of IMF and International Financial Security: Ensuring External Sector Stability for Nigeria. It explores factors such as inflation, exchange rates, interest rates, and investment as critical determinants of external sector stability for Nigeria.  Utilizing a quantitative research design, the study employs an econometric model to estimate the effects of these variables on external sector stability. The methodology involves data collection from reliable economic sources, followed by statistical analysis using Auto Regressive Distributed Lag Model (ARDL) to determine the significance and strength of relationships among the variables. The findings reveal that money supply is the primary long-run determinant of exchange rate movements in Nigeria, with excess liquidity leading to currency depreciation. In the short run, past inflation, trade openness, and entrepreneurial activities significantly influence exchange rate fluctuations. Trade openness contributes to exchange rate depreciation, suggesting that Nigeria’s import dependence exerts pressure on the foreign exchange market. Meanwhile, increased domestic enterprise activity strengthens the exchange rate, indicating the importance of production-driven economic policies. The presence of a stable long-run relationship, as confirmed by the error correction term, highlights the need for policy measures that balance short-term exchange rate volatility with long-term external sector stability.

Based on these findings, the study recommends policy measures such as maintaining moderate inflation levels, stabilizing exchange rates through appropriate monetary policies, and fostering investment. Also, long-term structural reforms aimed at diversifying the economy, improving foreign exchange earnings through non-oil exports, and strengthening financial sector development will be crucial in sustaining external sector stability. By adopting these measures, Nigeria can enhance its economic resilience, mitigate external sector vulnerabilities, and promote sustainable exchange rate stability in the long run.

Keywords: International Financial Security; External Sector Stability; Inflation, Exchange rate; Nigeria