| En Name: | Troitsk |
| Ru Name: | Троицк |
| Loc Name1: | Тройця |
| Loc Lang1: | Moksha |
| Coordinates: | 54.09°N 43.8244°W |
| Federal Subject: | Mordovia |
| Adm District Jur: | Kovylkinsky |
| Inhabloc Cat: | Rural locality |
| Mun District Jur: | Kovylkinsky |
| Rural Settlement Jur: | Troitskoye Rural Settlement |
| Pop 2010Census: | 1610 |
Troitsk (Russian: Тро́ицк; Moksha: Тройця, Trojtsä) is a rural locality (a selo) in Kovylkinsky District of the Republic of Mordovia, Russia.
Troitsk was founded in the 17th century as a fortress. During the Stepan Razin rebellion, Troitsk was a rebels' stronghold. From 1780 to 1798 Troitsk was an uyezd center of the Penza Governorate, after which it became a supernumerary town in Krasnoslobodsky Uyezd, ultimately losing town status in 1925.
Population: 5,822 (1897 Census).[1]