Subramanian, 79, who passed away here today, was cabinet secretary from August 1, 1996, to March 31, 1998.
"Shri TSR Subramanian distinguished himself as an outstanding civil servant. He also left a mark with his prolific writings and interventions on important public causes. Saddened by his demise. My thoughts and prayers are with his family and friends," the PM tweeted.
Defence Minister Nirmala Sitharaman, Minister of State for Personnel Jitendra Singh and senior IAS officers also joined the prime minister in condoling his death.
Jitendra Singh said he was saddened by news of the demise and sent his condolences to the entire IAS fraternity and the family.
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Adding a poetic note, Anil Swarup, secretary, Department of School Education and Literacy, said: Bichde sab bari bari (all left one by one)."
One of the most outstanding officer T S R Subramanian is no more. Rest in Peace. RIP, he said on Twitter.