Consolidated net profit of Rs 6,381 crore in January- March is as against Rs 5,881 crore in the same period a year ago, the company said in a statement.
Revenue fell to Rs 67,470 crore from Rs 103,428 crore on slump in oil prices in the forth quarter of 2014-15 fiscal.
RIL earned USD 10.1 on turning every barrel of crude oil into fuel as compared to a gross refining margin of USD 9.3 per barrel in the fourth quarter of previous 2013-14 fiscal.
RIL Chairman and Managing Director Mukesh D Ambani said: "In a time when the collapse of crude oil prices unsettled the hydrocarbons markets, our refining business delivered record earnings.
"The earnings power demonstrated by our hydrocarbon businesses in this environment validates our philosophy of investing in world-scale, cost competitive assets, cutting- edge technology and the talent of people.