| Trześniówka | |
| Mouth Location: | Vistula |
| Mouth Coordinates: | 50.6811°N 21.7983°W |
| Subdivision Type1: | Country |
| Subdivision Name1: | Poland |
| Subdivision Type2: | Voivodeship |
| Subdivision Name2: | Podkarpackie, Świętokrzyskie |
| Pushpin Map: | Poland#Poland Świętokrzyskie Voivodeship |
The Trześniówka is a river in Poland, and a right-bank tributary of the Vistula (near the city of Sandomierz). Its length is 56.9 km with a basin area of 569.6 km². During the Central European floods in June 2010 Trześniówka flooded parts of Sandomierz.