Lily River

{{Infobox river

| name = Lily River

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| image = Chute de la Lili.jpg

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| image_caption = The Chute de la Lily (Lily waterfall), downstream from the village of Ampefy

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| subdivision_type1 = country

| subdivision_name1 = Madagascar

| subdivision_type2 = region

| subdivision_name2 = Itasy Region

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| source1 = Lake Itasy

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| mouth = Sakay River

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| mouth_coordinates = {{coord|-18.9958|46.4990|format=dms|type:river_region:MG|display=inline,title}}

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| river_system = Tsiribihina River

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The Lily River is a river in central Madagascar. It is the main outflow of Lake Itasy, and flows northwestward to join the Sakay River, a tributary of the Tsiribihina.Battistini, R., Richard-Vindard, G. (eds) (1972) Biogeography and Ecology in Madagascar. Monographiae Biologicae, vol 21. Springer, Dordrecht. https://doi.org/10.1007/978-94-015-7159-3_5

The upper stretch of the river is in Itasy Region. The lower stretch of the river forms the boundary between Itasy Region on the north and Bongolava Region on the south.