Lontra River

{{Infobox river

| name = Lontra River

| image =

| image_size =

| image_caption =

| source1_location = Tocantins state

| mouth_location =

| subdivision_type1 = Country

| subdivision_name1 = Brazil

| length =

| source1_elevation =

| mouth_elevation =

| discharge1_avg =

| basin_size =

}}

The Lontra River is a river of Tocantins state in central Brazil and a tributary of the Araguaia River.