Soninho River

{{Infobox river

| name = Soninho River

| name_other = Rio Soninho

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| pushpin_map = Brazil

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| river_system = Do Sono River

| progression =

| source1_location = Mateiros, Tocantins

| source1_coordinates= {{coord|-10.227830|-46.608604}}

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| mouth_location = Do Sono River

| mouth_coordinates = {{coord|-10.181875|-46.935478|display=inline,title}}

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| subdivision_type1 = Country

| subdivision_name1 = Brazil

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The Soninho River ({{langx|pt|Rio Soninho}}) is a river of Tocantins state, Brazil. It is a headwater of the Do Sono River.

The Soninho river forms on the northeast boundary of the {{convert|158885|ha}} Jalapão State Park, a fully protected conservation unit created in 2001.{{citation|ref={{harvid|PES do Jalapão– ISA}}|language=Portuguese |title=PES do Jalapão|publisher=ISA: Instituto Socioambiental |url=https://uc.socioambiental.org/uc/3235|accessdate=2016-06-11}}

It runs west along the north boundary of the park to the point where it meets the Novo River from the right to form the Do Sono River.