How many private sector banks are there in India?

There are 21 private-sector banks in India
They are:
Catholic Syrian Bank, City Union Bank, Dhanlaxmi Bank, Federal Bank, Jammu, and Kashmir Bank,  Karnataka Bank, Karur Vysya Bank, Lakshmi Vilas Bank, Nainital Bank, Ratnakar Bank, South Indian Bank, Tamilnad Mercantile Bank, Axis Bank, Development Credit Bank, HDFC Bank, ICICI Bank, IndusInd Bank, Kotak Mahindra Bank, Yes Bank, IDFC Bandhan Bank, of Bandhan Financial Services.