| Rainier | |
| Settlement Type: | Hamlet |
| Pushpin Relief: | yes |
| Pushpin Map: | Canada Alberta#Canada |
| Pushpin Map Caption: | Location of Rainier |
| Subdivision Type: | Country |
| Subdivision Name: | Canada |
| Subdivision Type1: | Province |
| Subdivision Name1: | Alberta |
| Subdivision Type2: | Region |
| Subdivision Name2: | Southern Alberta |
| Subdivision Type3: | Census division |
| Subdivision Name3: | 2 |
| Subdivision Type4: | Municipal district |
| Subdivision Name4: | County of Newell |
| Government Type: | Unincorporated |
| Leader Title1: | Governing body |
| Leader Name1: | County of Newell Council |
| Established Title: | Established |
| Population As Of: | 2020 |
| Population Footnotes: | [1] |
| Population Total: | 22 |
| Timezone: | MST |
| Utc Offset: | −07:00 |
| Timezone Dst: | MDT |
| Utc Offset Dst: | −06:00 |
| Coordinates: | 50.3683°N -112.0925°W |
| Postal Code Type: | Postal code |
| Area Code: | 403, 587, 825 |
| Blank Name: | Highways |
| Blank1 Name: | Waterways |
Rainier is a hamlet in southern Alberta, Canada within the County of Newell. It is located west of Highway 36 and approximately southwest of Brooks.
The population of Rainier according to the 2020 municipal census conducted by the County of Newell is 22.[1]