This PhD thesis examines the impact of fluctuations in global agricultural commodity markets on future food security in Arab countries. The thesis is divided into three parts with multiple chapters. Part one provides an overview of global food consumption patterns and reasons for volatility in wheat, rice and maize markets. Part two analyzes agricultural characteristics and food security issues in Arab countries. Part three measures the impact of international food price changes on domestic prices and consumption in Arab countries, finding some countries more vulnerable. It recommends short-term policies like export restrictions and long-term policies to reduce dependence on imports by enhancing domestic agriculture.