Banana peels are rich in nutrients containing 60.2% carbohydrates, 8.1% protein, 12.1% fat and 8.2% fiber (Table 1). Because of the high nutrient content of banana peels it was selected as a possible alternative substrate for the production of citric acid using A. niger. Solid-state fermentation is a well adopted process for cultivating fungi on natural vegetal resources which are broken down by excreted hydrolytic enzymes. It offers numerous advantages for production of bulk chemicals and enzymes. This is because solidstate processes have lower energy requirements and produce much less waste water and environmental concerns linked to disposal of solid wastes. Solid-state fermentation is drastically affected by various factors such as selection of a suitable strain, substrate and