| Type: | commune |
| County: | Bacău |
| Târgu Trotuș | |
| Leader Name: | Cătălin Sabău |
| Leader Party: | PSD |
| Leader Term: | 2020 - 2024 |
| Coordinates: | 46.2667°N 66°W |
| Elevation: | 237 |
| Area Total: | 32.1 |
| Population Total: | auto |
| Postal Code: | 607630 |
Târgu Trotuș (hu|Tatros) is a commune in Bacău County, Western Moldavia, Romania. It is composed of three villages: Târgu Trotuș, Tuta (Diószeg), and Viișoara (Viszóra).
At the 2021 census, the commune had a population of 5,330, an increase from the 2011 census, when the population was 4,969. At the 2002 census, 99.9% of inhabitants were ethnic Romanians; 63.3% were Roman Catholic and 36.5% Romanian Orthodox.