Studies on physico-chemical changes during growth and development of Aonla (Emblica officinalis Gaertn.) fruit cv. Narendra Aonla-10 was carried out with objectives to observe the physical and chemical changes during growth & development of fruits and to determine the maturity index for right stage of fruits harvesting at Main Experimental Station of Department of Fruit Science, Acharya Narendra Deva University of Agriculture and Technology, Kumarganj, Ayodhya-224229 (U.P.) India, during 2019-2020.