一种定向能量武器，以高温的等离子团作为杀伤手段。

此武器经常出现在科幻电影、小说、游戏或动画中。 其实这种武器是可能出现在未来的。 利用激光技术实现把重氢加热变成温度很高的等离子团，再用电磁场令这团东西飞往目标。 又或用超高频电磁波令波束聚焦处的空气高度电离。

When discussing weapons in science fiction, a plasma weapon is a type of raygun that fires a stream, bolt(s), pulse or toroid of plasma (i.e. very hot, very energetic excited matter). The primary damage mechanism of these fictional weapons is usually thermal transfer; it typically causes serious burns, and often immediate death of living creatures, and melts or evaporates other materials. In certain fiction, plasma weapons may also have a significant kinetic energy component, that is to say the ionized material is projected with sufficient momentum to cause some secondary impact damage in addition to causing high thermal damage. In some fictions, like Star Wars, plasma is highly effective against mechanical targets such as droids. The ionized gas disrupts their systems.