Ōruawharo River

{{Short description|River in the North Island, New Zealand}}

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

{{Use New Zealand English|date=October 2023}}

{{Infobox river

| name = Ōruawharo River

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| image = File:Atiu Creek Regional Park - Oruawharo River.jpg

| image_size = 270px

| image_caption = The Oruawharo River as seen from Ātiu Creek Regional Park, draining into the Kaipara Harbour

| image_alt =

| map = {{Infobox mapframe|type=line|plain=yes|zoom=10|frame-align=center|frame-width=270|frame-height=270|stroke-color=#0000ff|stroke-width=2}}

| map_size = 270px

| map_caption = Route of the Ōruawharo River

| map_alt =

| pushpin_map = Auckland#Northland#New Zealand

| pushpin_map_size = 270px

| pushpin_map_caption= Mouth of the Ōruawharo River

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| subdivision_type1 = Country

| subdivision_name1 = New Zealand

| subdivision_type2 = Region

| subdivision_name2 = Northland Region, Auckland Region

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| source1 = Confluence of the Topuni River and Maeneene Creek

| source1_location =

| source1_coordinates= {{coord|-36.2587|174.4697|type:river_region:NZ|display=inline}}

| source1_elevation =

| mouth = Ōruawharo River

| mouth_location =

| mouth_coordinates = {{coord|-36.2978|174.284|type:river_region:NZ|display=inline,title}}

| mouth_elevation =

| progression = Ōruawharo River → Kaipara Harbour → Tasman Sea

| river_system =

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| basin_landmarks = Hargreaves Basin

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| tributaries_left = Wharehine River, Wharehanu Creek, Takapau Creek, Takahe Creek, Atiu Creek, Mullet Creek, Oturapa Creek

| tributaries_right = Koareare Creek, Kaira Creek

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The Ōruawharo River is a river on the North Auckland Peninsula of New Zealand. It flows westward into the Kaipara Harbour west of Wellsford. It forms part of the boundary between the Northland region and the Auckland Region.

The New Zealand Ministry for Culture and Heritage gives translations of "place of [a] stretched-out pit" or "place of Ruawharo [a personal name]" for Ōruawharo.{{Cite web|url=https://nzhistory.govt.nz/culture/maori-language-week/1000-maori-place-names|title=1000 Māori place names|publisher=New Zealand Ministry for Culture and Heritage|date=6 August 2019}}