Ōmaha River

{{Short description|River in the Auckland Region, New Zealand}}

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

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

{{Infobox river

| name = Ōmaha River

| native_name =

| name_other =

| name_etymology =

| nickname =

| image = 20230101 114346 Omaha River.jpg

| image_size = 270px

| image_caption = The mouth of the Ōmaha River

| image_alt =

| map = {{Infobox mapframe|type=line|plain=yes|zoom=11|frame-align=center|frame-width=270|frame-height=270|stroke-color=#0000ff|stroke-width=2}}

| map_size = 270px

| map_caption = Route of the Ōmaha River

| map_alt =

| pushpin_map = Auckland#New Zealand

| pushpin_map_size = 270px

| pushpin_map_caption= Mouth of the Ōmaha River

| pushpin_map_alt =

| subdivision_type1 = Country

| subdivision_name1 = New Zealand

| subdivision_type2 = Region

| subdivision_name2 = Auckland Region

| subdivision_type3 =

| subdivision_name3 =

| subdivision_type4 =

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| subdivision_type5 =

| subdivision_name5 =

| length = {{convert|7|km|mi|abbr=on|0}}

| width_min =

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| discharge1_location=

| discharge1_min =

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| source1 =

| source1_location =

| source1_coordinates= {{coord|-36.3359|174.7199|type:river_region:NZ|display=inline}}

| source1_elevation =

| mouth = Whangateau Harbour

| mouth_location =

| mouth_coordinates = {{coord|-36.31573|174.75706|type:river_region:NZ|display=inline,title}}

| mouth_elevation =

| progression = Ōmaha River → Whangateau Harbour → Hauraki Gulf / Tīkapa Moana

| river_system =

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| tributaries_left = Tamahunga Stream

| tributaries_right =

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}}

The Ōmaha River is a river of the Auckland Region of New Zealand's North Island. It flows south to reach the Pacific Ocean at the western end of Whangateau Harbour, {{convert|3|km|mi|0}} west of Ōmaha.