Ratnakar Hari Kelkar (22 June 1901 in Alibag – 14 November 1985 in New Delhi) was a revisor and translator of the Bible into Marathi.

While working at the Post Office he continued his studies and received the BA degree of the University of Bombay in 1926.

He worked in the Indian Postal Department for 34 years and retired in 1956 as the Deputy Presidency Post Master of Bombay GPO.

While working in the Postal Service, he also studied accountancy and law, and cultivated a keen interest in religion, culture, history, language, and literature.

The first Marathi translation of the Holy Bible had been published in the early years of the 19th century by William Carey and his associates at Serampore in West Bengal, India.