飞船（英语：Airship）是一种轻于空气的航空器，也是人类第一种可以受控进行自由飞行的航空器。一般具有一个巨大的气囊和推进、操纵系统。飞艇通过向艇体气囊中充入轻于空气的气体（如氦气等）升空，用发动机带动螺旋桨推动艇身，以艇尾尾面操纵航行方向。根据其材料结构的不同，飞艇可以分为硬式飞艇、软式飞艇和半硬式飞艇（半软式飞艇）。飞艇曾被广泛用于海上巡逻、反潜、远程轰炸和空运兵力，也曾作为一种空中民用交通工具19世纪末20世纪初风靡一时。飞机出现后飞艇的主要作用变为以观光为主的商业运输，并在现代广告业中发挥着重要作用。

An airship or dirigible is a type of aerostat or lighter-than-air aircraft that can navigate through the air under its own power. Aerostats gain their lift from large gas bags filled with a lifting gas that is less dense than the surrounding air.

In early dirigibles, the lifting gas used was hydrogen, due to its high lifting capacity and ready availability. Helium gas has almost the same lifting capacity and is not flammable, unlike hydrogen, but is rare and relatively expensive. Significant amounts were first discovered in the United States and for a while helium was only used for airships by the United States. Most airships built since the 1960s have used helium, though some have used hot air.