"India is the only BRIC country, where growth will accelerate, to 8 per cent in FY16 and 8.3 per cent in FY17, based on revised data series," Fitch said in its report on Global Economic Outlook.
The forecast has been made taking in reference the revised GDP data series.
The agency's earlier forecasts were 6.5 per cent for 2015-16 and 6.8 per cent for 2016-17, based on the old series.
The Central Statistical Office (CS0) has recently changed the base year for calculation of GDP to 2011-12 from 2004-05 earlier.
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The CSO estimates the country's real GDP growth at 7.4 per cent in the current financial year.
Recently, International Monetary Fund Managing Director Christine Lagarde had said the country's economy is likely grow at 7.2 per cent in FY15 and will exceed combined total of Japan and Germany by 2019.
"Using India's new GDP series, the IMF expects growth to pick up to 7.2 per cent this fiscal year and accelerate further to 7.5 per cent next year-- making India the fastest growing large economy in the world," Lagarde, who was on a two-day visit in the country last week, said.
It, however, said these new GDP growth levels and the pick-up from mid-2013 are difficult to reconcile with indicators and anecdotal evidence that show low investment levels, weak corporate balance sheets and a rise in banks' non-performing loans.
"While plenty of policy initiatives will likely have a positive effect on real GDP growth, including structural reforms and some fiscal and monetary policy loosening, the impact of such measures takes time to show up in higher growth," the report said.
Globally, Fitch expects GDP to grow by 2.7 per cent in FY16 and 3 per cent in FY17, up from an estimate of 2.5 per cent in FY15.