The Nash 600 was an automobile manufactured by the Nash-Kelvinator Corporation of Kenosha, Wisconsin from 1940 through the 1949 model year, after which the car was renamed the Nash Statesman. The '600' name comes from the car's ability to go 600 miles (970 km) on one tank of gasoline (20 gallon tank and 30 miles/gallon).

The "600" is generally credited with being the first mass-produced American automobile that constructed through unitized body/frame construction in which the car body and the frame are welded as one rather than the (then) more traditional body-on-frame (the body is bolted to the frame). Unitized construction allowed Nash to advertise that the car was lighter in weight, quieter, and more rigid than its competitors.

The 1948 Nash 600 (and Ambassador Custom) bore the work of Helene Rother, Nash's new interior stylist. They featured some of the most stylish interiors in the industry. Among her contributions were upholstery and trim colors that harmonized with specific exterior colors.