The feeding habits of Indian giant flying squirrels (Petaurista philippensis Elliot 1839) were studied in the Sitamata Wildlife Sanctuary, Rajasthan, India, from March 2009 to February 2010. Feeding by flying squirrels was arboreal and consisted entirely of plant materials. Based on 5,071 feeding records, 20 plant species belonging to 13 families were used. Madhuca longifolia was the most eaten species (31.85% of annual diet) followed by Terminalia bellirica (17.11 %), Terminalia tomentosa (9.52%) and Diospyros melanoxylon (8.09%). The most consumed food part was the pith (78.06%) with other plant parts (twigs, leaves, bark, flowers, buds, fruits and seeds) comprising 21.94% of the annual diet. Early night was found to be the most active time for feeding, and feeding reduced until 0530 hrs.