| Erco | |
| Pushpin Map: | Corsica#France |
| Subdivision Type1: | Country |
| Subdivision Name1: | France |
| Subdivision Type2: | Region |
| Subdivision Name2: | Corsica |
| Subdivision Type3: | Department |
| Subdivision Name3: | Haute-Corse |
| Mouth: | Golo |
The Erco (Corsican: '''Ercu''') is a stream in the department of Haute-Corse, Corsica, France.It is a tributary of the Golo.
The Erco is long.It crosses the communes of Calacuccia, Corscia and Lozzi.The stream originates in the commune of Lozzi to the south of the Monte Cinto.It flows in a generally southeast direction to its confluence with the Golo between Calacuccia and Corscia.The D84 road crosses the Erco just above its mouth, but otherwise there are no roads along its course.
Measurements of the stream flow were taken at the Calacuccia [Cuccia] station from 1979 to 1993.The watershed above this station covers .Annual precipitation was calculated as .The average flow of water throughout the year was .
The following streams (ruisseaux) are tributaries of the Erco: