B. S. Gnanadesikan (20 January 1949 – 15 January 2021) was an Indian politician. He was born in Tamil Nadu, India. He was a member of the Tamil Maanila Congress. From 2001 to 2013, Gnanadesikan was a member of the Rajya Sabha.
Gnanadesikan died on 15 January 2021 in Chennai, India at the age of 71.