Grand Morin

{{Short description|River in France}}

{{Infobox river

| name = Grand Morin

| image =

| image_caption =

| pushpin_map = France#France Île-de-France

| source1_location = Champagne

| mouth_location = Marne

| mouth_coordinates = {{coord|48|54|1|N|2|49|50|E|format=dms|display=inline,title}}

| progression = {{RMarne}}

| subdivision_type1 = Country

| subdivision_name1 = France

| length = {{convert|118|km|mi|abbr=on}}

| source1_elevation =

| discharge1_avg =

| basin_size = {{convert|1180|km2|mi2|abbr=on}}

}}

The Grand Morin ({{IPA|fr|ɡʁɑ̃ mɔʁɛ̃}}, literally Great Morin) is a {{convert|118|km|mi|adj=on}} long river in France, left tributary of the Marne.{{sandre|id=F65-0400|nom=Le Grand Morin}} Its source is near the village of Lachy. Its course crosses the departments of Marne and Seine-et-Marne. It flows westwards through the towns of Esternay, La Ferté-Gaucher, Coulommiers and Crécy-la-Chapelle, finally flowing into the Marne in Esbly.

Its main tributary is the Aubetin.