Trigno

{{Infobox river

| name = Trigno

| image =

| image_caption =

| source1_location = Monte Capraro

| mouth = Adriatic Sea

| mouth_coordinates = {{coord|42.0630|14.7968|display=it|region:IT_type:river}}

| subdivision_type1 = Country

| subdivision_name1 = Italy

| length = {{convert|85|km|mi|abbr=on}}

| source1_elevation = {{convert|1150|m|ft|abbr=on}}

| mouth_elevation = {{convert|0|m|ft|abbr=on}}

| discharge1_avg =

| basin_size =

}}

The Trigno (Latin Trinius) is an {{convert|85|km|mi|adj=on}} Italian river. It originates in the Apennine Mountains, in the province of Isernia and flows into the Adriatic Sea near Vasto. It also forms the border between the regions Abruzzo and Molise.{{cite book |last=Di Marco |first=Michele Antonio |date=2020 |title=Mundunur: A Mountain Village Under the Spell of South Italy |url=https://www.google.com/books/edition/Mundunur_A_Mountain_Village_Under_the_Sp/NzMPEAAAQBAJ |publisher=Via Media Publishing |page=29 |isbn=9781893765580 |access-date=January 12, 2025}}