The B120 commercial truck debuted in February 1971, based on the B110 passenger car chassis. The B120 used the same wheelbase and running gear of the Datsun 1200 sedans, coupe and wagon models. Initially it used the same stainless steel grille as the 1200 sedan, and the rectangular gauges of the Standard model B110s. Both regular (B120) and longbed (GB120) models were offered. After the 1200 car series ceased production the B120 continued.

Interestingly, in certain markets the B120 was actually badged as 120Y, to correspond as part of the updated 120Y range. The B120 ute was sold in Australia until 1985. It was marketed in New Zealand during the 1980s in two trims: RoadStar and SportStar. This model was known as a bakkie in South Africa. It´s capable of 49 mpg (17,3 Km/L) In 1978, in the Japan market the B121 model replaced the B120, with the most notable change being a switch to a plastic grille of the type used by the B110 Coupe. Also notable was a change to upscale round instrumentation.