Smoothwater River

{{Short description|River of New Zealand's South Island}}

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

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

{{Infobox river

| name = Smoothwater River

| image =

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| source1_location = Stafford Range

| mouth_location = Tasman Sea

| subdivision_type1 = Country

| subdivision_name1 = New Zealand

| length = {{convert|8|km|mi|abbr=on}}

| source1_elevation =

| mouth_elevation =

| discharge1_avg =

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}}

The Smoothwater River is a river of the West Coast Region of New Zealand's South Island. It flows north to reach the Tasman Sea three kilometres west of the western end of Jackson Bay.{{LINZ|3000|Smoothwater River|2010-06-07}}