| Official Name: | Northwestern Switzerland |
| Native Name: | Nordwestschweiz |
| Settlement Type: | Region |
| Area Total Km2: | 1958.2 |
| Area Footnotes: | [1] |
| Population As Of: | 2007 |
| Population Total: | 1031400 |
| Population Footnotes: | [2] |
| Population Density Km2: | auto |
| Blank Name Sec1: | NUTS code |
| Blank Info Sec1: | CH03 |
| Blank Name Sec2: | HDI (2018) |
| Blank Info Sec2: | 0.940[3] · 4th |
Northwestern Switzerland (de|Nordwestschweiz, fr| Suisse du Nord-Ouest, it|Svizzera nordoccidentale), as defined by the Federal Statistical Office for statistical purposes, is a NUTS-2 region of Switzerland. As it encompasses the entire cantons of Basel-Stadt, Basel-Landschaft, and Aargau, it does not cover the same area as the traditional region of the same name (Nordwestschweiz in German), which also includes Basel-Stadt and Basel-Landschaft, but also certain northern parts of the canton of Solothurn and only parts of the canton of Aargau.