Longeau (river)

{{Expand French|date=June 2012|Longeau (rivière)|topic=geo}}

{{Infobox river

| name = Longeau

| image =

| image_size =

| image_alt =

| image_caption =

| pushpin_map = France#France Grand Est

| source1_location = Hannonville-sous-les-Côtes

| source1_coordinates= {{coord|49.0212|5.636}}

| mouth_location = Yron

| mouth_coordinates = {{coord|49.1477|5.8578|display=inline,title}}

| progression = Yron→ Orne→ {{RMoselle}}

| subdivision_type1 = Country

| subdivision_name1 = France

| location =

| length = {{convert|37.5|km|mi|abbr=on}}

| source1_elevation =

| mouth_elevation =

| discharge1_avg =

| basin_size = {{convert|213|km2|mi2|abbr=on}}

| tributaries_left =

| tributaries_right =

}}

The Longeau ({{IPA|fr|lɔ̃ʒo}}) is a {{convert|37.5|km|mi|adj=on}} long river in the Grand Est of northeastern France.{{sandre|id=A81-0210|nom=Le Longeau}} It rises in Hannonville-sous-les-Côtes and runs generally northeast to join the river Yron at Jarny.