Allameh Arif Hussain Wahidi, the secretary general of the Jafari movement, in a statement condemned the Saudi crime and said the Riyadh regime is targeting Islam and the united Ummah.
He said Muslims all over the world disavow and strongly denounce this divisive act.
Allameh Wahidi also said that Pakistani Muslims, will continue to hold rallies against the Al Saud.
Sheikh Nimr was among 47 individuals who were put to death on Saturday.
The senior cleric had been arrested in 2012 in the Qatif region of Saudi Arabia’s Shia-majority Eastern Province, which was the scene of peaceful anti-regime demonstrations at the time.
He had been charged with instigating unrest and undermining the kingdom’s security. He had rejected the charges as baseless.
His execution has drawn widespread condemnation from around the world.
Supreme Leader of the Islamic Revolution Ayatollah Seyed Ali Khamenei on Sunday said this "unrightfully shed blood will rapidly afflict the politicians and executives”.
Ayatollah Khamenei also criticized the so-called advocates of human rights, freedom and democracy for remaining silent over the shedding of this innocent blood, stressing that the Muslim world should feel responsibility over this issue.