<b>Comparative Study of Production of Single Cell Protein from Different Agricultural Waste Substrates using Aspergillus Niger</b> Single cell protein SCP also referred as microbial protein is defined as protein derived from cells of microorganisms such as yeast, fungi, algae, and bacteria, which are grown on various carbon sources for synthesis. The dried cells of microorganisms or the whole organism is harvested and consumed. In this work SCP was produced from different agricultural waste substrates like food and vegetable waste, rice husk, pulses husk, bagasse and wheat straw using Aspergillus niger. These substrates not only act as nutritive supplement but also ensure good waste management. Also, carbohydrate content of each sample was determined. For maximizing the yield of SCP, some factors were optimized. Various buffers were used like phosphate buffer, carbonate bicarbonate buffer and 0.1N NaOH. The sample that shows the best result for SCP was identified to be MCD and fruit and vegetable waste in 50 50 ratio and rice husk. In the future SCP could be produced to not only be used to produce protein but multiple products rich in carbohydrate, vitamins, lipids and other amino acids. Also yield could be increased by genetically modifying SCP organisms. Single cell protein, substrates, Aspergillus niger 99-102 Issue-2 Volume-5 Abhishikta Dasgupta | Jasmine Chughasrani