Indian Institute of Science, Bengaluru (M.Tech., Aerospace Engineering) S. Unnikrishnan Nair is an Indian aerospace engineer presently serving as the director of Vikram Sarabhai Space Centre (VSSC).

[1] He is known for his works in the field of launch vehicle design, Space Capsule Recovery Experiment (SRE), and Human Spaceflight Programme.

Prior to his directorship of VSSC, he was Director of Human Space Flight Centre, Bengaluru.

He is currently the director of Vikram Sarabhai Space Centre.

He was holding the additional charge of the director at the Indian Institute of Space Science and Technology during the year 2022 to 2024.