The Infiniti J30, marketed as the Nissan Leopard J Ferie in Japan, was a rear wheel drive luxury car. The J30 went into production on April 7, 1992 as a 1993 model to replace the M30 (which was a coupe), and was launched in the United States after its competitors, the Lexus GS and Acura Legend. The car was sold in the mid-size sedansegment between the smaller G20 and the larger Q45, both by size and price. The small interior resulted from its rounded styling uncharacteristic of the crowded executive car class, which is now considered an early variant of a four-door coupé.

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The J30 was designed at Nissan Design International (NDI) in La Jolla, California under the direction of president Jerry Hirshberg and exterior designer Doug Wilson in 1988-1989. Hirshberg said it was "the first car in what we see as a trend toward breaking away from the long tyranny of the wedge".[2] Design work was frozen in 1989. In a promotional video produced in 1994, it was referred to as a "personal luxury sedan" as attempt to define it as a four-door coupé. The rounded styling resembles the contemporary Nissan Altima/Bluebird U13, also styled at NDI at approximately the same time