The Nissan Skyline (スカイライン in Japanese) is a line of compact cars and compact executive cars originally produced by the Japanese premium carmaker Prince Motor Company starting in 1955 and subsequently by Nissan after the two companies merged in 1966. After the merger, the Skyline and its larger counterpart, the Nissan Gloria, were sold in Japan at dealership sales channels called Nissan Prince Shop.

It is currently available in either coupé, or sedan body styles, and are most commonly known by their round brake lights, with the station wagon bodystyle being dropped in 1989 with the introduction of the R32 platform.

Iterations R30 to R35 of the Skyline are still popular tuner cars for Japanese car enthusiasts from the 1980s to today, especially with available features such as straight-6 engines, turbochargers, and the high-performance GT-R trim. While not distributed in the United States, the Skyline's prominence in video games, movies and magazines resulted in many such cars being imported there from 1999 to late 2005, after Motorex petitioned the National Highway Traffic Safety Administration to allow 1990–1999 GT-Rs and GTSs to be imported, at the condition that they were modified to meet United States Federal Motor Vehicle Safety Standards.