The Fium'Alto (or Fium'Altu) is a small coastal river in the department of Haute-Corse, Corsica, France.

It crosses the communes of Carcheto-Brustico, Casalta, Croce, Ficaja, Monacia-d'Orezza, Penta-di-Casinca, Piano, Piazzole, Piedicroce, Piedipartino, Pie-d'Orezza, Porri, La Porta, Pruno, Rapaggio, Scata, Stazzona, San-Damiano, San-Gavino-d'Ampugnani and Taglio-Isolaccio.

[1] The Fium'Alto rises to the south of the 1,767 metres (5,797 ft) Monte San Petrone in the commune of Pie d'Orezza.

It flows southeast past the village of Pie d'Orezza, east past Piedicroce and Stazzona, then generally north and east to the town of Folelli (Penta-di-Casinca) and the sea.

The average flow of water throughout the year was 1.38 cubic metres per second (49 cu ft/s).