| Osiniak-Piotrowo | |
| Settlement Type: | Village |
| Total Type: | |
| Subdivision Type: | Country |
| Subdivision Type1: | Voivodeship |
| Subdivision Name1: | Warmian-Masurian |
| Subdivision Type2: | County |
| Subdivision Name2: | Pisz |
| Subdivision Type3: | Gmina |
| Subdivision Name3: | Ruciane-Nida |
| Coordinates: | 53.65°N 51°W |
| Pushpin Map: | Poland |
| Pushpin Label Position: | bottom |
| Population Total: | 171[1] |
| Population As Of: | 2022 |
Osiniak-Piotrowo is a village in the administrative district of Gmina Ruciane-Nida, within Pisz County, Warmian-Masurian Voivodeship, in northern Poland.[2] It lies approximately 4km (02miles) west of Ruciane-Nida, 210NaN0 west of Pisz, and 680NaN0 east of the regional capital Olsztyn.