Aka River

{{Infobox river

| name = Aka River

| native_name ={{native name|ja|赤川}}

| name_other = Akagawa

| name_etymology = Red River

| image = Akagawa Tsuruoka.jpg

| image_size =

| image_caption = Aka River flowing through the city of Tsuruoka

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| subdivision_type1 = Country

| subdivision_name1 = Japan

| subdivision_type2 = State

| subdivision_name2 = Honshu

| subdivision_type3 = Region

| subdivision_name3 = Yamagata

| subdivision_type4 =

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|length_km=70

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| source1 = {{interlanguage link|Mount Itoh|ja|以東岳}}

| source1_location =

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| source1_elevation = {{convert|1,771|m|abbr=on}}

| mouth = Sea of Japan

| mouth_location =

| mouth_coordinates = {{coord|38.8471|139.7841|type:river_region:JP|format=dms|display=inline,title}}

| mouth_elevation =

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|basin_size_km2=857

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{{Nihongo|Aka River|赤川|Akagawa|extra=lit. 'red river'}} is a river in Yamagata Prefecture, Japan. It flows into the Sea of Japan.{{Cite web |script-title=ja:日本の川 - 東北 - 赤川 - 国土交通省水管理・国土保全局 |work=mlit.go.jp |access-date=31 March 2021 |url= https://www.mlit.go.jp/river/toukei_chousa/kasen/jiten/nihon_kawa/0212_akagawa/0212_akagawa_00.html |language=ja }}