Mahajilo River

{{Infobox river

| name = Mahajilo River

| name_native =

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| map = Madagascar rivers.svg

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| map_caption = Map of Malagasy rivers (Mahajilo flows from the central highlands to the Tsiribihina River).

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| subdivision_type1 = Country

| subdivision_name1 = Madagascar

| subdivision_type2 =

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| subdivision_type4 =

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| subdivision_type5 = City

| subdivision_name5 = Miandrivazo

| length = {{convert|260|km|mi|abbr=on}}

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| discharge1_location= Tsiribihina Riverat Miandrivazo[http://webworld.unesco.org/water/ihp/db/shiklomanov/part'4/AFRICA/Madagascar/1mg`ma~1.htm webworld.unesco.org - Discharge at Miandrivazo, 1982/3]

| discharge1_min = {{convert|53.2|m3/s|cuft/s|abbr=on}}

| discharge1_avg = {{convert|517|m3/s|cuft/s|abbr=on}}at Miandrivazo[http://webworld.unesco.org/water/ihp/db/shiklomanov/part'4/AFRICA/Madagascar/1mg`ma~1.htm webworld.unesco.org - Discharge at Miandrivazo, 1982/3]

| discharge1_max = {{convert|1530|m3/s|cuft/s|abbr=on}}January

| source1 = Sakay River and Kitsamby

| source1_location =

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| mouth =

| mouth_location = Tsiribihina River, Menabe

| mouth_coordinates = {{coord|19|41|00|S|45|22|23|E|display=inline,title}}

| mouth_elevation =

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| river_system = Tsiribihina River

| basin_size = {{convert|14375|km2|abbr=on}}

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Mahajilo is a river in Menabe, western Madagascar. It is formed by the affluents of the Sakay river and Kitsamby river. It flows down from the central highlands, to flow into the Tsiribihina River.

Rafting trips are purposed by several operators on this river from Miandrivazo.