The Lexus RX (Japanese: レクサス・RX, Rekusasu RX) is a mid-size luxury crossover SUV sold since 1998 by Lexus, a luxury division of Toyota. Originally released in its home market of Japan in late 1997 as the Toyota Harrier, export sales began in March 1998 as the Lexus RX. Four generations of the Lexus RX have been produced to date, the first being compact in size, and the latter three classified as mid-size. Both front- and four-wheel drive configurations have been used on the RX series, and several gasoline powertrain options, including V6 engines and hybrid systems, have been offered. In the Lexus model lineup, the RX sits below the larger GX and LX (Known as the Toyota Land Cruiser Prado and the Toyota Land Cruiser body-on-frame SUVs outside North America), and above the smaller NX crossover with a lesser displacement inline-four engine. The name "RX" stands for "Radiant Crossover". It has also been labelled as "Recreational Cross Country" in some markets. The RX's current Toyota counterparts are the Highlander/Kluger; past counterparts were the Harrier and Venza.
The first-generation RX 300, fitted with a 3.0-liter V6 engine, began sales in 1998. The Japanese market Toyota Harrier released in 1997 also offered a 2.2-liter inline-four, later uprated to 2.4-liters. The second-generation RX 300 (3.0-liter V6) and RX 330 (3.3-liter V6) models went on sale in 2003, with both variants supplanted by the more powerful RX 350 (3.5-liter V6) in 2006.