The Otrøelva river is a small river in Innlandet, Norway, that originates from headwaters in the Filefjell mountains to Lake Vangsmjøse. It is a part of the Begna river watershed, joining the Begna above Lake Vangsmjøse.

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61°11′23″N 8°13′07″E / 61.1896°N 8.2186°E / 61.1896; 8.2186