Smyth River

{{Short description|River in New Zealand}}

{{Use New Zealand English|date=April 2024}}

{{Use dmy dates|date=July 2019}}

{{Infobox river

| name = Smyth River

| image =

| image_size =

| image_caption =

| source1_location =

| mouth_location = Wanganui River

| subdivision_type1 = Country

| subdivision_name1 = New Zealand

| length =

| source1_elevation =

| mouth_elevation =

| discharge1_avg =

| basin_size =

}}

The Smyth River is a river of the West Coast Region of New Zealand's South Island. It is an upper tributary of the Wanganui River, which it meets to the west of Mount Whitcombe.