Parliament attack convict Afzal Guru was hanged at Delhi's Tihar Jail on Saturday, Union home minister Sushil Kumar Shinde said.
The execution took place at 8am. Guru will be buried at the jail, where he had been lodged for nearly eight years.
According to reports, the home ministry had recommended the death sentence on January 23 and President Pranab Mukherjee rejected his mercy petition on January 26.
Curfew has been imposed in several areas of Jammu and Kashmir, including capital Srinagar and Sopore, Guru´s hometown.