The Cessna 400 is a single-engine, fixed-gear, low-wing general aviation aircraft built from composite materials by Cessna Aircraft. It was previously called the Columbia 400 and was built by Columbia Aircraft. The design was derived from the Lancair IV kit aircraft.

The design is also produced in a slightly lower-performance model, the Cessna 350. The 350 and 400 offer high cruise speeds and are "all-electric" aircraft with standard electronic flight displays, with the option of Avidyne Entegra or Garmin G1000.

The Cessna 400 is the second-fastest FAA-certified single-engined piston aircraft in production today, and the fastest with fixed landing gear, reaching a speed of 235 knots true air speed, at 25,000 feet. Only the retractable-gear Mooney M20TN Acclaim is faster, at 242 knots.

Specifications (Cessna 400)

General characteristics
- Crew: 1 pilot
- Capacity: 3 passengers
- Length: 25 ft 2 in (7.67 m)
- Wingspan: 36 ft 1 in (11.0 m)
- Height: 9 ft 0 in (2.74 m)
- Wing area: 141 ft² (13.1 m²)
- Empty weight: 2,200 lb (1,000 kg)
- Max takeoff weight: 3,600 lb (1,500 kg)
- Powerplant: 1× Teledyne Continental TSIO-550-C flat-6 engine, 310 hp (230 kW)

Performance
- Maximum speed: 235 knots (270 mph, 435 km/h)
- Range: 1,274 mi (1,107 nm, 2,038 km)
- Service ceiling 25,000 ft (7,600 m)
- Rate of climb: 1,500 ft/min (7.6 m/s)
- Wing loading: 25.5 lb/ft² (125 kg/m²)
- Power/mass: 0.091 hp/lb (150 W/kg)