Aujon

{{Infobox river

| name = Aujon

| image = L'Aujon, le lavoir à Longchamp-sur-Aujon (Avril 2007).jpg

| image_caption = The Aujon, with a wash house, at Longchamp-sur-Aujon.

| map = Aujon.png

| source1_location = Perrogney-les-Fontaines

| source1_coordinates= {{coord|47|48|50|N|05|10|46|E}}

| mouth_location = Aube

| mouth_coordinates = {{coord|48|09|20|N|04|47|50|E|display=inline,title}}

| progression = {{RAube}}

| subdivision_type1 = Country

| subdivision_name1 = France

| length = {{convert|68|km|mi|abbr=on}}

| source1_elevation = {{convert|430|m|ft|abbr=on}}

| mouth_elevation = {{convert|185|m|ft|abbr=on}}

| discharge1_avg = {{convert|6.45|m3/s|cuft/s|abbr=on}}

| basin_size = {{convert|480|km2|sqmi|abbr=on}}

}}

The Aujon ({{IPA|fr|oʒɔ̃}}) is a {{convert|68|km|mi|abbr=on}} long river in the Haute-Marne and Aube departments in northeastern France.{{sandre|id=F11-0400|nom=L'Aujon}} Its source is at Perrogney-les-Fontaines. It flows generally northwest. It is a right tributary of the Aube into which it flows at Longchamp-sur-Aujon.