Troitsk (Russian: Троицк) is a rural locality (a selo), and one of two settlements in Petropavlovsky National Rural Okrug of Ust-Maysky District in the Sakha Republic, Russia, in addition to Petropavlovsk, the administrative center of the Rural Okrug.

It is located 11 kilometers (6.8 mi) from Ust-Maya, the administrative center of the district and 3 kilometers (1.9 mi) from Petropavlovsk.

Its population as of the 2002 Census was 74.

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