Os i Østerdalen
{{Infobox settlement
|official_name = Os
|other_name = Os i Østerdalen
|native_name =
|native_name_lang =
|nickname =
|settlement_type = Village
|image_skyline = Utsikt over Os fra Kvennåsen.jpg
|image_caption = View of the village area
|pushpin_map = Innlandet#Norway
|pushpin_label_position = top
|pushpin_label =
|pushpin_mapsize =
|pushpin_map_caption = Location of the village
|subdivision_type = Country
|subdivision_name = Norway
|subdivision_type1 = Region
|subdivision_name1 = Eastern Norway
|subdivision_type2 = County
|subdivision_name2 = Innlandet
|subdivision_type3 = District
|subdivision_name3 = Østerdalen
|subdivision_type4 = Municipality
|subdivision_name4 = Os Municipality
|timezone1 = CET
|utc_offset1 = +01:00
|timezone1_DST = CEST
|utc_offset1_DST = +02:00
|area_total_km2 = 1.01
|population_as_of = 2021
|population_total = 672
|population_density_km2 = 667
|postal_code_type = Post Code
|postal_code = 2550 Os
|coordinates = {{coord|62.49649|11.22331|region:NO_type:city|display=inline,title}}
|elevation_m = 600
|elevation_footnotes = {{Cite web |title=Os, Os (Innlandet) |url=https://www.yr.no/nb/v%C3%A6rvarsel/daglig-tabell/1-187043/Norge/Innlandet/Os/Os |publisher=yr.no |accessdate=2022-01-31}}}}
Os or Os i Østerdalen is the administrative centre of Os Municipality in Innlandet county, Norway. The village is located along the upper part of the river Glåma, about {{convert|15|km}} northeast of the village of Tolga and about {{convert|12|km}} southwest of the town of Røros. The Os Church is located in the village.{{Cite encyclopedia |title=Os (tettstad i Østerdalen) |encyclopedia=Store norske leksikon |publisher=Kunnskapsforlaget |url=https://snl.no/Os_-_tettstad_i_%C3%98sterdalen |date=2021-11-01 |editor-last=Mæhlum |editor-first=Lars |language=Norwegian |accessdate=2022-01-31}}
The {{convert|1.01|km2|acre|adj=on}} village has a population (2021) of 672 and a population density of {{convert|667|PD/km2}}. This village is the only urban area in the municipality according to Statistics Norway.{{Cite web |last=Statistisk sentralbyrå |date=1 January 2021 |title=Urban settlements. Population and area, by municipality |url=https://www.ssb.no/en/befolkning/statistikker/beftett/aar |authorlink=Statistics Norway}}
The village lies in the Glåma river valley and the mountain Håmmålsfjellet lies about {{convert|4|km}} south of the village. The village of Dalsbygda lies about {{convert|8|km}} to the northwest of this village and the village of Narbuvoll lies about {{convert|20|km}} to the southeast of this village.
The village lies along the County Road 30 and the Rørosbanen railway line, with a stop at Os Station.