Mambare River is a river in Oro Province, Papua New Guinea, located at 8.05°S 148.0333333°E / -8.05; 148.0333333.

Alluvial gold was discovered in the river at the end of the 19th century. By 1898 there were 150 miners working on the Mambare and Girua Rivers.[1]
The Imperial Japanese had a supply dump located at the mouth of the Mambare River during World War II.
Rivers of Papua New Guinea | |
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| Major rivers | |
| Mainland New Guinea |
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| New Britain | |
| New Ireland | |
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