手电筒或称手灯筒、手电灯筒、电筒或电棒，是一种手持式电子照明工具。

一个典型的手电筒有一个经由电池供电的灯泡和聚焦反射镜，并有供手持用的手把式外壳。

虽然是相当简单的设计，它一直迟至19世纪末期才被发明，因为它必须结合电池与电灯泡的发明。在早期因为电池的蓄电力不足，因此在英文中它被称为"flashlight"，意即短暂的灯。

A flashlight (more often called a torch outside North America) is a portable hand-held electric light. Usually, the source of the light is a small incandescent light bulb or light-emitting diode (LED). A typical flashlight consists of a light bulb mounted in a reflector, a transparent cover (sometimes combined with a lens) to protect the light source and reflector, a battery, and a switch. These are supported and protected by a case.