The Toyota 4Runner is an SUV manufactured by the Japanese automaker Toyota and marketed globally since 1984, across six generations. In Japan, it was marketed as the Toyota Hilux Surf (Japanese: トヨタ・ハイラックスサーフ, Hepburn: Toyota Hairakkususāfu) and was withdrawn from the market in 2009. The original 4Runner was a compact SUV and little more than a Toyota Hilux pickup truck with a fiberglass shell over the bed, but the model has since undergone significant independent development into a cross between a compact and a mid-size SUV. All 4Runners have been built in Japan at Toyota's plant in Tahara, Aichi, or at the Hino Motors (a Toyota subsidiary) plant in Hamura.

The name "4Runner" was created by copywriter Robert Nathan with the Saatchi & Saatchi advertising company as a play on the term "forerunner". The agency held contests to invent new names for Toyota's forthcoming vehicles. According to Toyota, the "4" described the vehicle's 4-wheel drive system while "Runner" was a reference to its all-terrain capabilities and how it could "run" off-road.

For some markets, the Hilux Surf was replaced in 2005 by the lower cost but similar Fortuner, which is based on the Hilux platform.

As of 2021, the 4Runner is marketed in the Bahamas, Bolivia, Canada, Chile, Colombia, Costa Rica, El Salvador, Guatemala, Panama, Peru, the United States and Venezuela. Many markets that did not receive the 4Runner, such as Europe and the Middle East, instead received the similarly designed Land Cruiser Prado, another SUV that shared many of the same components.

The 4Runner came in at number five in a 2019 study by iSeeCars.com ranking the longest-lasting vehicles in the US. The 4Runner had 3.9 percent of vehicles over 200,000 miles (320,000 km), according to the study.