The Southwestern United States (also known as the American Southwest or simply the Southwest) is a region defined in different ways by different sources. Broad definitions include nearly a quarter of the United States, including Arizona, California, Colorado, Nevada, New Mexico, Oklahoma, Texas and Utah. Narrowly defined, the "core" Southwest is centered around the Four Corner states, with parts of the other states making up the beginnings and endings of the Southwest. The five main southwestern states; Arizona, New Mexico, Colorado, Utah, and Nevada are also all considered part of the Mountain West, as well as the southwest. The total population of these states is roughly 19 million people.

Als Südwesten der Vereinigten Staaten wird eine Region der Vereinigten Staaten bezeichnet. Die Abgrenzung zum Mittleren Westen, der Westküste, den Mountain States und den Südstaaten ist unscharf, je nach Verwendung werden unterschiedliche Teile der USA zum Südwesten gerechnet.

Югозападът (на англ.: The Southwest) е регион в САЩ.