| Pinyinyi | |
| Native Name: | Kata ya Pinyinyi |
| Native Name Lang: | sw |
| Settlement Type: | Ward |
| Pushpin Map: | Tanzania |
| Coordinates: | -2.4289°N 35.8428°W |
| Subdivision Type: | Country |
| Subdivision Type1: | Region |
| Subdivision Name1: | Arusha Region |
| Subdivision Type2: | District |
| Subdivision Name2: | Ngorongoro District |
| Subdivision Type3: | Ward |
| Subdivision Name3: | Pinyinyi |
| Population As Of: | 2016 |
| Population Total: | 5,230 |
| Timezone: | EAT |
| Utc Offset: | +3 |
Pinyinyi (Hajaro, in Sonjo) is an administrative ward in the Ngorongoro District of the Arusha Region of Tanzania. The area was historically part of Sonjo people's ancestral land. The Masai arrived in the 1950s, eventually the Sonjo abandoned Hajaro in 1987 due to Masai violence over grazing land. The Maasai renamed it Pinyinyi.[1] In 2016 the Tanzania National Bureau of Statistics report there were 5,230 people in the ward, from 8,482 in 2012.[2] [3]