Authion

{{for|the Authion Massif|French Prealps}}

{{Infobox river

| name = Authion

| image = Authion.jpg

| image_caption = The Authion in Brain-sur-l'Authion

| pushpin_map = France Pays de la Loire#France

| source1_location =

| mouth = Loire

| mouth_location =

| mouth_coordinates = {{coord|47.4213|-0.5525|display=inline,title|format=dms|region:FR}}

| progression = {{RLoire}}

| subdivision_type1 = Country

| subdivision_name1 = France

| length = {{convert|99.8|km|mi|abbr=on}}

| source1_elevation =

| discharge1_avg =

| basin_size = {{convert|1497|km2|abbr=on}}

}}

The Authion ({{IPA|fr|otjɔ̃}}) is a {{convert|99.8|km|mi|abbr=on}} long river in western France located in the departments of Indre-et-Loire (Centre-Val de Loire) and Maine-et-Loire (Pays de la Loire). It is a tributary of the river Loire on the right side.{{Sandre|L9--0220|l'Authion}} It flows into the Loire in Sainte-Gemmes-sur-Loire, near Angers. Its longest tributaries are the Lathan and the Couasnon. The largest towns on the Authion are Bourgueil, Mazé-Milon, Brain-sur-l'Authion, Trélazé and Les Ponts-de-Cé. Its basin area is {{convert|1497|km2|abbr=on}}.[https://www.sage-authion.fr/le-territoire/geomorphologique/ Bassin versant de l’Authion], SAGE Authion