Northwestern Switzerland (German: Nordwestschweiz, French: Suisse du Nord-Ouest, Italian: 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.

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