Trostianets is a city in Sumy Oblast, Ukraine.
Trostianets or Troscianiec may also refer to other places in Ukraine:
Railway stations Trostyanets-Smorodyne railway station, Southern Railways station
Urban settlements Trostianets, Vinnytsia Oblast, a settlement that was formerly the administrative seat of Trostianets Raion.
Villages Trostianets, Saranchuky rural hromada, Ternopil Raion, Ternopil Oblast, a village in Ternopil Oblast Trostianets, Stryi Raion, Lviv Oblast, a village in Stryi Raion, Lviv Oblast Trostianets, Odesa Oblast, a village in Rozdilna Raion, Odesa Oblast Trostianets, Volyn Oblast, a village in Lutsk Raion, Volyn Oblast Trostianets, Zaliztsi rural hromada, Ternopil Raion, Ternopil Oblast, a village in Ternopil Oblast Trostianets, Zolochiv Raion, Lviv Oblast, a village in Zolochiv Raion, Lviv Oblast Trostianets Velykyi, a village in Poltava Raion in Poltava Oblast