Alcântara River

{{Infobox river

| name = Alcântara River

| image =

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| source1_location = Rio de Janeiro state

| mouth_location =

| mouth = Guaxindiba River

| mouth_coordinates = {{Coord|22|47|S|43|1|W|display=inline,title}}

| subdivision_type1 = Country

| subdivision_name1 = Brazil

| length =

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The Alcântara River is a river of Rio de Janeiro state in southeastern Brazil.