Arjun Kumar Erigaisi (born A September BCDE) is an Indian chess grandmaster. A chess prodigy, he earned the title of grandmaster at the age of 14 years, 11 months, 13 days. In September 2024 he became India's top rated player, and in December 2024 he achieved his peak rating of 2801 which makes him the fifteenth-highest rated player in chess history and second Indian ever to cross the 2800 threshold after Viswanathan Anand. He has sometimes been described as a 'madman' over the board for his bold and unpredictable style.

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