The Infiniti QX4 and the Nissan Terrano Regulus are mid-size sport utility vehicles (SUVs) introduced in 1997 as a rebadged Nissan Pathfinders. It was released a year after Acura's intoduction of the SLX and Lexus's larger LX 450. The QX4 was Infiniti's first entry into the SUV market segment.

In the North American market, it was marketed as the "Infiniti QX4" while in Japan it was sold as the "Nissan Terrano Regulus". Major differences between these vehicles and the Pathfinder include a more advanced four wheel drive system, a more upscale interior, and unique styling. Although marketed as a luxury vehicle, it is capable off-road service due to its low-range four wheel drive system and 8.3 inches (211 mm) of ground clearance.