S. Ramakrishnan (born 6 May 1954) is the founder president of Amar Seva Sangam, Ayikudi, Tamil Nadu, India.

On 10 January 1975, while he was in his fourth year of engineering, he attended a selection interview for naval officers held in Bangalore.

It was here that he was motivated by his orthopedic physician and mentor Air Marshall Dr. Amarjit Singh Chahal, after whom Ramakrishnan named the organization he founded six years later.

The institute was registered as Amar Seva Sangam and was situated in a small piece of land donated by Ramakrishnan's parents.

[1] It started with a handful of children and involved in a few activities related to polio prevention and rehabilitation, and is now spread over 30 acres of land and houses diverse activities including: Schooling for children with disabilities and vocational training for persons with disabilities are being provided free of cost.