The Otadaonanis River is a river in northeastern Kenora District in northwestern Ontario, Canada.

[1] It is in the James Bay drainage basin and is a right tributary of the Kapiskau River.

The Otadaonanis River begins on gravel and flows north-northeast to its mouth at the Kapiskau River, 7.5 kilometres (4.7 mi) upstream of the latter river's mouth at James Bay.

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