Určiniškė is a village in Šilalė District Municipality, in Tauragė County, Lithuania. Určiniškė lies at 144 m above sea level. The nearest city is Tauragė, 39 km to the southwest. Among the landmarks around are Church of the Immaculate Conception, Kražiai (9.3 km), Church of St. George (5.7 km) and Church of St. Peter and St. Paul (23 km). Among the natural features are Medvėgalis (13.1 km).