Petrovsk-Zabaykalsky (Russian: Петровск-Забайкальский, IPA: [pʲɪˈtrofsk zəbɐjˈkalʲskʲɪj]) is a town and the administrative center of Petrovsk-Zabaykalsky District of Zabaykalsky Krai, Russia, located along the Balyaga River in the valley between Zagan-Daban and Zagorinsky mountain ranges, 413 kilometers (257 mi) southwest of Chita.

[8] Before the exploration expeditions of the Russian Cossacks in the 17th century, the future Petrovsk-Zabaykalsky's location was a route junction of nomadic Buryat tribes.

The settlement, founded in 1789 and known then as Petrovsky Zavod (Петровский Завод),[citation needed] grew and developed around its iron refinery.

In a restored house of the princess Ekaterina Troubetskaya, wife of Sergey Trubetskoy, was organized a museum, which opened on October 10, 1980.

In Petrovsk-Zabaykalsky's historical district there are several buildings related to the times of Decembrists in the town.