The organisation said state governments had imposed 20 temporary internet shutdowns in 2017.
Authorities say they shut internet and telecommunications services to stop rumours during times of unrest.
But the rights group said arbitrary internet shutdowns "violated India's obligations under international human rights law".
Indian authorities frequently shut telecommunication services in Indian-administered Kashmir.
Earlier this month, the government in the western state of Maharashtra shut down internet services after protests led by farmers turned violent.