双翼机，指拥有两副机翼的固定翼飞机，莱特兄弟所发明的莱特飞行器即采用双翼上下并列配置布局。此类布局机翼的总面积比单翼机大，在低速飞行时可以产生较大的升力，因此这种布局也被飞机历史上早期的主流所采用。

A biplane is a fixed-wing aircraft with two main wings stacked one above the other. The first aircraft to fly, the Wright Flyer, used a biplane wing arrangement, as did most aircraft in the early years of aviation. While a biplane wing structure has a structural advantage over a monoplane, it produces more drag than a similar unbraced or cantilever monoplane wing. Improved structural techniques, materials and the quest for greater speed made the biplane configuration obsolete for most purposes by the late 1930s.