| 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 (German: Nordwestschweiz, French: Suisse du Nord-Ouest, Italian: Svizzera nordoccidentale) is the common name of the region of Switzerland encompassing the cantons of Basel-Stadt, Basel-Landschaft and Aargau. It is one of the NUTS-2 regions of Switzerland.