Northwestern Switzerland, 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.