Narenjbon-e Pain (, also Romanized as Nārenjbon-e Pā’īn; also known as Nārenj Bon) is a village in Otaqvar Rural District, Otaqvar District, Langarud County, Gilan Province, Iran. At the 2016 census, its population was 66, in 22 families. Down from 105 people in 2006.

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