| Ellero | |
| Map: | Ellero.png |
| Map Size: | 280 |
| Subdivision Type1: | Country |
| Subdivision Name1: | Italy |
| Subdivision Type2: | Region |
| Subdivision Name2: | Piedmont |
| Subdivision Type3: | Province |
| Subdivision Name3: | Province of Cuneo |
| Length: | 34.6km (21.5miles) |
| Discharge1 Location: | near Bastia Mondovì |
| Discharge1 Avg: | 5.2[1] |
| Source1: | Pian Marchisio |
| Source1 Location: | Ligurian Alps |
| Mouth: | Tanaro |
| Mouth Coordinates: | 44.4431°N 7.8856°W |
| Basin Size: | 197.45km2 |
| Tributaries Right: | Maudagna |
The Ellero is a 34.6km (21.5miles)[2] long river in northwestern Italy (Piedmont).
The river is a tributary to the river Tanaro, which is a tributary of the river Po. Its source is in Pian Marchisio, a large plateau of the Ligurian Alps. It flows northwards digging the Valle Ellero, which ends in the Po plain near Roccaforte Mondovì.[3] The Ellero then follows its course through the plain turning NE, crosses Villanova Mondovì (where it gets from right hand the Maudagna, its main tributary) and then after Mondovì, with some meanders, reaches Bastia Mondovì where it joins the river Tanaro.