Gregory II (died 1058) was the son of Alberic III, Count of Tusculum and Ermelina.
The Chronicon Monasterii Casinensis of Leo of Ostia records him as Gregorius de Alberico.
Like his many forefathers, he carried the illustrious title of Romanorum patricius, consul, dux et senator ("Patrician, consul, duke, and senator of the Romans"), implying his secular command over Rome and its militia.
His dual comital title implied his land- and fortress-holding power in both Rome itself and Tusculum, as supported by his alliance with the Papacy.
In 1044, he led the expedition to restore his brother, Pope Benedict IX.