The Honda Integra (Japanese: ホンダ インテグラ, Hepburn: Honda Integura), sold in North America as the Acura Integra and later the Acura RSX, is an automobile produced by the Japanese company Honda from 1985 until 2006, and then since 2021. It succeeded the Quint as a more luxurious and sport-oriented derivative of the Civic. The Integra was one of the launch models for Acura in the US in 1986 alongside the Acura Legend. Throughout its production run, the Integra was highly regarded for its handling and performance. The 1995–2001 Integra Type R is widely regarded as one of the best front-wheel-drive cars of all time.

The Integra nameplate was revived in 2021 after a 16-year hiatus. The Honda Integra nameplate is used for a restyled Honda Civic sedan for the Chinese market, while the Acura Integra nameplate is used for a Civic-based liftback for North America, replacing the Acura ILX.

This vehicle debuted in Japan in February 1985 as the Honda Quint Integra, available only at Honda's Japanese dealership sales channel Honda Verno before going on sale a year later in North America as part of the then-new luxury Acura lineup. The three-door liftback was the only model available originally, with a five-door arriving in October 1985, and a four-door saloon bodystyle becoming available in Japan in the autumn of 1986. Only the liftback versions were sold in the U.S. A 1.6 L DOHC 16-valve four-cylinder engine powered most versions. The engine was the vehicle's most publicized feature, as DOHC, multi-valve engines were not commonplace in entry-level models at the time. In most European countries, only the five-door liftback was offered, as a replacement for the Honda Quint. Typically for European Integras, only the 1.5-liter 85 PS (63 kW; 84 hp) 4 Weber carburetors engine was available. The five-door liftback model was also sold in Australia rebadged as the Rover 416i. Except for in Britain, Honda did not offer the more powerful 1.6 DOHC fuel injection engine (in the UK known as the Integra EX16) in Europe. The ZC engine was also shared with the Honda Concerto, which was sold at newly established Japanese dealership sales channel called Honda Clio, which sold luxury oriented products like the Honda Legend.

In Japan, while the VX- and RX-trimmed four-door (DA2) used the 1.5 L EW5 engine, all other model and trim combinations offered only the DOHC ZC engine, with a carburetor on GS, ZS, and LS trim packages, and PGM-FI on the top level GSi three- and five-door, and the RSi three-door trim package. Vehicles installed with a carburetor earned 15.4 km/L (44 mpg_‑imp; 36 mpg_‑US) in Japanese Government emissions tests and 115 PS (84.6 kW; 113.4 bhp), and 26 km/L (73 mpg_‑imp; 61 mpg_‑US) at consistent speeds above 60 km/h (37.3 mph). Vehicles with PGM-FI earned 14.4 km/L (41 mpg_‑imp; 34 mpg_‑US) in Japanese Government emissions tests with 135 PS (99.3 kW; 133.2 bhp), and 24.5 km/L (69 mpg_‑imp; 58 mpg_‑US) above 60 km/h (37.3 mph). In Japan, the Integra took the entry level marketing position at Honda Verno, below the sporty Prelude and larger, luxury focused Vigor.

Compared to the US, the European Integra was aimed downmarket and generally lacked equipment, with neither trim level (LX or EX) offering painted bumpers, central locking, power windows, nor air conditioning, even though a small number of fully equipped, left-hand drive fuel-injected Integras were sold in the Netherlands. The Integra EX16 did offer a sunroof, painted bumpers, a rear spoiler and Hi-Fi stereo equipment, but neither electric windows, central locking nor air conditioning were available. This was considered as a drawback to its European competitors such as the Peugeot 309 1.6 injection and the Renault 11 Turbo, that all could be equipped with comprehensive, albeit expensive, equipment. The first Integra never became as popular in Europe as it did in the US, but was praised by most motor magazines for its styling and overall road performance. The styling reflected the popularity of Honda's performance coupe, the Honda Verno sports coupe companion Honda Prelude, with the Integra offering a coupe for added cargo accommodation, and a slightly smaller appearance to the larger Honda Vigor. Largely unencumbered by emissions regulations, British market cars produce 85 PS (63 kW) in the 1.5 and 125 PS (92 kW) in the 1.6-liter EX16.

Being designed as the successor of the Honda Quint, the Integra is closely related to the Civic, although it featured a small list of key upgrades over its smaller stablemate to help merit a price increase over the CRX Si, which was otherwise the sportiest subcompact vehicle being offered by Honda Verno; enlarged 4-wheel disc brakes replaced the small front-disc/rear-drum setup used by the Civic and CRX, suspension calibration was re-worked, better tires were used and a 113-hp DOHC fuel-injected 16-valve engine was used in place of the SOHC unit from the CRX Si. Just like the Prelude and the Vigor of that period, the Integra featured sleek, sporty pop-up headlights, like its Japanese dealership Honda Verno stablemates, with the CRX adopting semi-concealed doors over the headlights. Nearly 228,000 units were sold during the four-year run of the first-generation model, most of them in the United States.

The first-generation Acura Integra came with 1.6-liter DOHC 16-valve 4-cylinder (D16A1) engine which received an update mid-cycle. The 86–87 engine is commonly called the "Browntop" while the 88–89 engines are referred to as the "Blacktop" due to the color of their valve covers. The improvements in the "blacktop" engine included lighter rods, domed pistons for slightly higher compression, and an electric advance distributor (the "browntop" came with a vacuum advance distributor). The overall gain in performance was about 5 hp (3.7 kW) for 118 hp (88.0 kW).

The Integra received a minor facelift in 1987 for the 1988 model year which featured slightly reshaped indicator lights, an improved climate control system and an update of the instrument clocks. In Europe, the Integra five-door Liftback was discontinued in October 1989 following the launch of the Rover-based Honda Concerto.