Sri Krishna Sinha (21 October 1887 – 31 January 1961) known as Dr. S. K. Sinha, Sri Babu and Bihar Kesari was the first Chief Minister of the Indianstate of Bihar (1946–61). Except for the period of World War II, Sinha was chief minister of Bihar from the time of the first Congress Ministry in 1937 until his death in 1961.

Along with the nationalists Dr. Rajendra Prasad  and Dr. Anugrah Narayan Sinha, Shri Babu is regarded among the Architects of Modern Bihar. led the Dalit entry into the Baidyanath Dham temple (Vaidyanath Temple, Deoghar), reflecting his commitment to the upliftment and social empowerment of dalits. He was the first Chief Minister in the country to abolish the zamindari system. He underwent different terms of imprisonment for a total of about eight years in British India. S.K.Sinha's mass meetings brought hordes of people to hear him. He was known as "Bihar Kesari" for his lionlike roars when he rose to address the masses. His close friend and eminent gandhian Bihar Vibhuti Dr. Anugrah Narayan Sinha in his essay mere Shri Babu wrote that, "Since 1921, the History of Bihar has been the history of the life of Shri Babu".
The former President of India, Pratibha Patil, released a book on the letters of exchange between Sinha and Prime Minister Jawaharlal Nehru titled Freedom and Beyond. The Nehru-Sinha correspondence touches on subjects such as Indian democracy in the making in early years of Independence, Centre-State relations, role of governor, turbulence in Nepal, Zamindari abolition and education scenario. Sinha was known for his scholarship and erudition and he had given his personal collection of 17,000 books to the public library in Munger in 1959 which is now named after him as Sri Krishna Seva Sadan