Hryhoriy Hulyanytsky (Ukrainian: Григорій Гуляницький) (died 1679) was a Ukrainian Cossack colonel, a skilled warrior and a shrewd politician.
Hryhoriy Hulyanytsky was born to a family of Ruthenian gentry of Ostoja Coat of Arms in the town of Korsun. His date of birth and earlier period of life are unknown.
During the Khmelnytsky Uprising of 1648-54, Hulyanytsky was sent by hetman Bohdan Khmelnytsky as an envoy to Muscovy. Hulyanytsky went to Moscow on two occasions, in 1649 and in 1654, to help negotiate the terms of the Treaty of Pereyaslav.
Hulyanytsky was appointed as colonel of Nizhyn in (1655–1659), and colonel of Korsun regiments in (1662–1664).
From the onset of the period of Ukrainian history known as the Ruin and during the civil war that followed, Hulyanytsky was an ardent supporter of hetman Ivan Vyhovsky and his pro-Polish policies. In particular, Hulyanytsky's participation was instrumental in the defeat of pro-Moscow adversaries of Vyhovsky Martyn Pushkar and Iakiv Barabash in 1657–1658.
During the civil war and the Muscovite invasion in 1658–1659, Hulyanytsky made several daring attacks against invading forces and Moscow's supporters. Hylyanytsky was also among several prominent Cossacks who wrote a famous letter to Ivan Bezpalyi – the then Moscow-appointed hetman – not to betray his country and Vyhovsky [1].