Formoso River (Tocantins)

{{Infobox river

| name = Formoso River

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| image_size = 300

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| pushpin_map = Brazil

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| subdivision_type1 = Country

| subdivision_name1 = Brazil

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| length = {{convert|550|km|mi|abbr=on}}{{cite book |last1=Ziesler |first1=R. |last2=Ardizzone |first2=G.D. |title=The Inland waters of Latin America |year=1979 |url=http://www.fao.org/docrep/008/ad770b/AD770B06.htm |publisher=Food and Agriculture Organization of the United Nations |isbn=92-5-000780-9 |chapter=Amazon River System |archiveurl=https://web.archive.org/web/20131021061745/http://www.fao.org/docrep/008/ad770b/AD770B06.htm |archivedate=21 October 2013 |url-status=live}}

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| source1 = Tocantins state

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| mouth = Javaés River

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| mouth_coordinates = {{coord|-10.573|-49.942|display=inline,title}}

| mouth_elevation = {{convert|180|m|abbr=on}}

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The Formoso River is a river of Tocantins state in central Brazil.