K. Varadarajan (October 4, 1946 – May 16, 2020) was an Indian politician and activist. He was a Politburo member of the Communist Party of India (Marxist) from Tamil Nadu of India. He also was Leader of All India Kisan Sabha.
Varadarajan died on May 16, 2020 at his home in Karur, Tamilnadu of respiratory failure, aged 73.