In a notification, the Union home ministry said that Hafiz Talha Saeed, 46, has been actively involved in recruitment, fund collection, and planning and executing attacks by the Lashkar-e-Tayiba in India and Indian interests in Afghanistan.
Hafiz Talha Saeed is a senior leader of the LeT and is the head of the cleric wing of the terrorist organisation.
India has also taken note of reports of Saeed's son Talha contesting elections in Pakistan and said the "mainstreaming" of radical terror outfits in the neighbouring country is nothing new and that it has been part of its State policy for a long time.
Mushtaq Ahmed Zargar, who was involved in a series of terror attacks in Jammu and Kashmir and was one of the released terrorists in the hijacking of Indian Airlines flight IC-814 in 1999, has been designated as a terrorist by the Union government.
Before the elections, concerns have been raised in the country over the participation of hardline Islamist groups in large numbers.
Gul is the sixth individual to have been designated as a terrorist by the Centre in the last fortnight.
Nengroo is the fifth individual to have been designated as a terrorist by the Centre in the last fortnight.
The JuD will contest the election on the platform of a little known "dormant" political entity, Allaha-u-Akbar Tehreek.