In aviation, a multiplane is a fixed-wing aircraft-configuration featuring multiple wing planes. The wing planes may be stacked one above another, or one behind another, or both in combination. Types having a small number of planes have specific names and are not usually described as multiplanes:

• Biplane - two wings stacked one above the other
• Triplane - three wings stacked one above another
• Tandem wing - two main planes, one behind the other. The tandem triple or tandem triplet configuration has three lifting surfaces one behind another.

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While triplane, quadruplane and tandem designs are relatively uncommon, aircraft with more than four sets of wings rarely occur - none have proven successful.

The quadruplane configuration takes the triplane approach a step further, using efficient wings of high aspect ratio and stacking them to allow a compact and light weight design. During the pioneer years of aviation and World War I, a few designers sought these potential benefits for a variety of reasons, mostly with little success.

From 1908, the American inventor Matthew Bacon Sellers Jr. made a series of flights in a quadruplane, progressively fitted with powerplants of decreasing power, in order to investigate low-powered flight. He eventually achieved flight on only 5 to 6 hp at a speed of 20 mph.

Pemberton-Billing Ltd. made two prototype Zeppelin killers, the Pemberton-Billing P.B.29E and Pemberton-Billing P.B.31E, respectively in 1915 and 1917. They were comparatively large, twin-engined fighters. After the company changed its name to Supermarine, the P.B.31E became known as the Supermarine Nighthawk.

Following test flights with the prototype Armstrong Whitworth F.K.9 in 1916, a small number of Armstrong Whitworth F.K.10 quadruplane reconnaissance fighters were produced, but none saw combat action.

The private-venture Wight Quadruplane scout fighter was flown in 1917.

The Euler Vierdecker of 1917 unusually featured a standard triplane arrangement of fixed wings with a fourth uppermost wing comprising left and right hand articulated surfaces which acted as full-span ailerons. Two examples were built, with different engines.

Also in 1917, Friedrichshafen created the even more unusual Friedrichshafen FF54 scout fighter, which featured narrow-chord second and third wings, with struts connecting only the upper pair and lower pair of planes. The prototype proved unacceptable in the air and was later modified as an equally unsuccessful triplane, again with a short-chord intermediate plane.

The Naglo D.II quadruplane fighter of 1918 featured a standard triplane arrangement with a smaller fourth wing attached below the main assembly, somewhat analogous to a sesquiplane. It participated in Germany's second D-type contest in 1918, and was praised for its construction and workmanship.

In 1922 Besson constructed the H-5, a prototype quadruplane flying boat transport. It was unusual in having two braced biplane wing stacks deeply staggered and vertically offset such that the four wing planes were stacked in an overall zig-zag arrangement.^[1] The only example was damaged and development was abandoned.

Any fixed-wing aircraft with more than four^{[citation needed]} wing planes may be referred to as a multiplane. Planes may be stacked vertically as with a biplane, or placed one in front of another as with a tandem wing. Both principles may be combined.

This list includes types having four or more wing planes.