牛日河（彝語北部方言：ꑍꉘꏛꒊꃀ，羅馬化：Nyip Hxo Ryx Yyp Mop[1]），是中国长江流域的一条河流，汇入大渡河中游，属于大渡河水系。河长123千米，流域面积4090平方千米，年均流量125立方米每秒。自然落差1960米。水能理论蕴藏量48万千瓦。[2]
参考文献
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