Prince Petre (Georgian: პეტრე), known in Russia as the tsarevich Pyotr Aleksandrovich Gruzinsky (Russian: Пётр Александрович Грузинский) (26 April 1857 – 3 February 1922) was a Georgian prince (batonishvili).

Born a descendant of the Kartli-Kakhetian branch of the Bagrationi dynasty, the former royal house of Georgia, Petre was the son of Prince Alexander Gruzinsky and his first wife, Princess Elena Tarkhan-Mouravi (1831-1903).

Prince Petre married Tamara Dekanozishvili (1897–1977), at an unknown date by the historians (certainly during the war turmoil).

She was born into a family of a Georgian nobility, whose family held the title of Aznauri.

[1][2] Tamara Dekanozishvili, who was 40 years his junior, was firstly [or secondly] married to Aleksandr Timofeevich Oboladze (1884–1923).