Târgu Trotuș

{{Infobox Romanian subdivision

|type = commune

|county = Bacău

|name = Târgu Trotuș

|image_flag =

|image_skyline = Targu Trotus - May 2013-002.JPG

|image_caption = The river Trotuș in Târgu Trotuș

|image_map = Targu Trotus jud Bacau.png

|map_caption = Târgu Trotuș within Bacău County

|image_location =

|leader_name = Cătălin Sabău

|leader_party = PSD

|leader_term = 2020–2024

|coordinates = {{coord|46|16|N|26|40|E|type:city_source:kolossus-itwiki|display=it}}

|elevation = 237

|elevation_min =

|elevation_max =

|area_total = 32.1

|area_footnotes =

|population_as_of =

|population_total = auto

|population_footnotes =

|postal_code = 607630

|area_code =

|website = {{URL|https://primariatgtrotus.ro/}}

}}

Târgu Trotuș ({{langx|hu|Tatros}}) is a commune in Bacău County, Western Moldavia, Romania. It is composed of three villages: Târgu Trotuș, Tuta (Diószeg), and Viișoara (Viszóra).

{{Historical populations

|source = Census data

|2002 |5354

|2011 |4969

|2021 |5330

}}

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.