Gagik II (Armenian: Գագիկ Բ; c. 1025 - May 5/November 24, 1079) was the last Armenian king of Bagratuni dynasty. Known as Gagik II King of Ani (Ani being the capital of the kingdom at the time), a juvenile at the time, he was enthroned as Gagik II and ruled for a brief period from 1042 to 1045 before the Bagratid dynasty rule collapsed in Armenia.

During the reign of Hovhannes-Smbat (John-Smbat), a feudal lord, David, who owned Taik during his battles against the Muslims, gained a large area which stretched all the way to Manzikert. David was a subject of Byzantium and when he died his entire territory was occupied by Basil II, who had resumed the policy of, bit by bit, annexing Armenia to his empire.

This policy of occupation and expansion was also pursued by the successors of Basil II. By the death of Hovhannes-Smbat around 1040 and that of Ashot IV shortly after, Michael V, one of the successors of Basil II, was the emperor cornering Armenia. Michael claimed that the Kingdom of Ani by virtue of the will of Hovhannes-Smbat, was bequeathed to the Byzantine Empire upon his death.

When the Armenian sparapet, Vahram Pahlavuni, prepared the coronation of the successor to Hovhannes-Smbat, the king's nephew, Gagik II, who at that time was only fourteen years old, the Byzantine emperor began supporting vestes Sargis Haykazn, a pro-Byzantine Armenian prince and minister of the former king, who had initially been appointed regent. After this the kingdom of Ani resisted three assaults of the Byzantine Empire, forcing them to retreat. Byzantium exerted its forces to the utmost in order to conquer Armenia and once and for all annexing it to the empire. To this end, they sent a great army to the southern part of Armenia and at the same time convinced the king of Tashir-Dzoraget to attack Ani from the east. At the fierce battle that was fought by the walls of Ani, general Vahram Pahlavuni heavily defeated the Byzantine army, forcing them to leave 20,000 dead behind, according to contemporary Armenian chroniclers. This victory allowed Vahram Pahlavuni along with Catholicos Petros I Getadardz to crown Gagik II king of Armenia and subsequently take the fortress of Ani, which was in the hands of Vest Sargis. Sargis fled to the fortress of St. Mary and was eventually captured.

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