| Kjósarhreppur | |
| Settlement Type: | Municipality |
| Mapsize: | 250px |
| Pushpin Map: | Iceland |
| Subdivision Type: | Country |
| Subdivision Name: | Iceland |
| Subdivision Type1: | Region |
| Subdivision Name1: | Capital Region (Greater Reykjavík) |
| Subdivision Type2: | Constituency |
| Subdivision Name2: | Southwest Constituency |
| Leader Title1: | Manager |
| Leader Name1: | Karl Magnús Kristjánsson |
| Unit Pref: | Metric |
| Area Total Km2: | 287.7 |
| Population Total: | 245 |
| Population As Of: | 2020 |
| Population Density Km2: | 0.85 |
| Postal Code Type: | Postal code(s) |
| Postal Code: | 276 |
| Code1 Name: | Municipal number |
| Code1 Info: | 1606 |
Kjósarhreppur (in Icelandic pronounced as /ˈcʰouːsar̥ˌr̥ehpʏr̥/), also known as Kjós in Icelandic pronounced as /ˈcʰouːs/, is a municipality in Iceland. It is the most northern part of the Capital Region and is adjacent to Reykjavík, Bláskógabyggð, and Hvalfjarðarsveit. Kjós is sometimes referred to as "a countryside in a city" (Icelandic: sveit í borg) due to its proximity to Reykjavík.
The primary industry in Kjós is agriculture.[1] It is home to a number of lakes and rivers, including the Laxá í Kjós, one of the most popular sites for salmon fishing in the country.[2]