Oloirien, Ngorongoro

{{Infobox settlement

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 * name                   = Oloirien Ward
 * native_name            = {{native phrase|sw|Kata ya Oloirien}}}
 * official_name          = Kata ya Oloirien, Wilaya ya Ngorongoro
 * nickname               =
 * settlement_type        = Ward
 * pushpin_map            = Tanzania
 * pushpin_label_position =
 * coordinates            =
 * subdivision_type       = Country
 * subdivision_name       = 🇹🇿 Tanzania
 * subdivision_type1      = Region
 * subdivision_name1      = Arusha Region
 * subdivision_type2      = District
 * subdivision_name2      = Ngorongoro District
 * area_total_km2         = 261.9
 * population_as_of       = 2012
 * population_total       = 9,485
 * population_density_km2 = auto
 * elevation_m            = 2,000

Oloirien is an administrative ward in the Ngorongoro District of the Arusha Region of Tanzania. The ward covers an area of 261.9 km2, and has an average elevation of 2,000 m. According to the 2012 census, the ward has a total population of 9,485.