Firth River

{{Infobox river

| name = Firth River

| name_native =

| name_native_lang =

| name_other =

| name_etymology =

| image = Firth River above Wolf Creek confluence, Ivvavik National Park, YT.jpg

| image_caption = Firth River above Wolf Creek confluence, Ivvavik National Park

| map =

| map_size =

| map_caption =

| pushpin_map =

| pushpin_map_size =

| pushpin_map_caption=

| subdivision_type1 = Countries

| subdivision_name1 = United States, Canada

| subdivision_type2 = States

| subdivision_name2 = Alaska, Yukon

| subdivision_type3 =

| subdivision_name3 =

| subdivision_type4 =

| subdivision_name4 =

| subdivision_type5 =

| subdivision_name5 =

| length =

| width_min =

| width_avg =

| width_max =

| depth_min =

| depth_avg =

| depth_max =

| discharge1_location=

| discharge1_min =

| discharge1_avg =

| discharge1_max =

| source1 =

| source1_location =

| source1_coordinates= {{coord|68.4777778|-141.8919444|type:river_region:US-NY|format=dms}}

| source1_elevation =

| mouth = Beaufort Sea, Arctic Ocean

| mouth_location = South of Herschel Island

| mouth_coordinates = {{coord|69.5500000|-139.5000000|type:river_region:US-NY|format=dms|display=inline,title}}{{cite gnis

| id = 1402078

| name = Firth River

| accessdate = 2020-04-21 }}

| mouth_elevation = {{convert|0|ft|abbr=on}}

| progression =

| river_system =

| basin_size =

| tributaries_left =

| tributaries_right =

| custom_label =

| custom_data =

| extra =

}}

Firth River is a major river in Yukon, Canada. It begins at the east side of Davidson Mountains and flows into the Beaufort Sea of the Arctic Ocean, just south of Herschel Island.