| Oloirien | |
| Settlement Type: | Ward |
| Pushpin Map: | Tanzania |
| Subdivision Type: | Country |
| Subdivision Type1: | Region |
| Subdivision Name1: | Arusha Region |
| Subdivision Type2: | District |
| Subdivision Name2: | Arusha District |
| Population As Of: | 2012 |
| Population Total: | 18679 |
| Official Name: | Kata ya Oloirien |
Oloirien is an administrative ward in the Arusha District of the Arusha Region of Tanzania. According to the 2012 census, the ward has a total population of 18,679.[1] 47% of the population are males and 53% are female.