Mérantaise

{{Infobox river

| name = Mérantaise

| image =

| image_caption =

| pushpin_map = France#France Île-de-France

| source1_location =

| source1_coordinates= {{coord|48|45|38|N|2|0|44|E|region:FR}}

| mouth_location = Yvette

| mouth_coordinates = {{coord|48|41|55|N|2|7|57|E|region:FR|display=inline,title}}

| progression = {{RYvette}}

| subdivision_type1 = Country

| subdivision_name1 = France

| length = {{convert|14.3|km|mi|abbr=on}}

| source1_elevation =

| discharge1_avg =

| basin_size =

}}

The Mérantaise is a small river in southern Île-de-France (France), left tributary of the Yvette, which is a tributary of the Orge. It is {{convert|14.3|km|mi|abbr=on}} long.{{sandre|id=F4659000|nom=La Merantaise}} Its source is in Voisins-le-Bretonneux, near Versailles, in the Yvelines department.