| Mount Alto | |
| Other Name: | Cnoc Ruairí |
| Elevation M: | 276 |
| Elevation Ref: | [1] |
| Prominence M: | 149 |
| Listing: | Marilyn |
| Location: | Kilkenny, Ireland |
| Map: | island of Ireland |
| Map Relief: | yes |
| Topo: | OSi Discovery 76 |
| Type: | Granite |
Mount Alto is a mountain in County Kilkenny, Ireland.
At 276 metres (906 feet), it is the 981st highest mountain in Ireland. It is situated near Brandon Hill and Coppanagh.