| Piero Mariani | |
| Birth Date: | 4 December 1911 |
| Birth Place: | Mortata, Italy |
| Position: | Midfielder |
| Years1: | 1928–1930 |
| Years2: | 1930–1933 |
| Years3: | 1933–1935 |
| Years4: | 1935–1940 |
| Years5: | 1940–1941 |
| Years6: | 1941–1942 |
| Clubs4: | Novara |
| Clubs6: | Lecco |
| Caps1: | 56 |
| Caps2: | 17 |
| Caps3: | 61 |
| Caps4: | 118 |
| Caps6: | 23 |
| Goals1: | 14 |
| Goals2: | 4 |
| Goals3: | 23 |
| Goals4: | 12 |
| Goals6: | 2 |
Piero Mariani (born December 4, 1911, in Mortata) was an Italian professional football player.