| Nationality: | Italian |
| Sport: | Athletics |
| Event: | Long-distance running |
| Birth Date: | 27 January 1957 |
| Country: |  Italy |
Mario Gelli (born 21 January 1957) is a former Italian male long-distance runner who competed at two editions of the IAAF World Cross Country Championships at senior level (1981, 1982).[1]