Sachin Nag (Bengali: শচীন নাগ; 5 July 1920 – 19 August 1987) was an Indian swimmer.

He won the gold medal in men's 100 m freestyle at the 1951 Asian Games, the first ever gold medal for India at the Asian Games.

He was also a member of the bronze medal-winning Indian teams in the men's 4x100 m freestyle relay and the men's 3x100 m medley relay at the 1951 Asian Games.

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