Lefini River
{{Infobox river
| name = Lefini River
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| subdivision_type1 = Country
| subdivision_name1 = Republic of the Congo
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| mouth = Congo River
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| mouth_coordinates = {{coord|2|56|17|S|16|8|01|E|display=inline,title}}
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Lefini River ({{langx|sw|Mto Lefini}}) is a river of the Republic of Congo and a tributary of the Congo River. Henry Morton Stanley reached the confluence on 9 March 1877.Stanley, H.M., 1899, Through the Dark Continent, London: G. Newnes, Vol. One {{ISBN|0486256677}}, Vol. Two {{ISBN|0486256685}}{{rp|Vol.Two,251}}