"N Chandrasekaran has been elected as the Chairman of the Board of Directors of the Company with effect from February 22, 2017 vide a written resolution of the Board," IHCL said in a BSE filing.
He was initially appointed as a Member of the Board on January 27, 2017, it added.
Chandrasekaran had taken over as Chairman of Tata Sons on February 21, becoming the first non-Parsi Chairman of the USD 103 billion Tata Group after heading its crown jewel TCS for years.
IHCL stock was trading marginally down at Rs 121.90 on BSE in the afternoon.