Fischertechnik is a brand of construction toy. It was invented by Artur Fischer and is produced by fischertechnik GmbH in Waldachtal, Germany. Fans often refer to Fischertechnik as "FT" or "ft". It is used in education[citation needed] for teaching about simple machines, as well as motorization and mechanisms. The company also offers computer interface technology, which can be used to teach the theory of automation and robotics.

The company is a German manufacturer of fasteners, and the original Fischertechnik set was intended as a Christmas (1964) novelty gift for engineers and buyers at industrial clients. The gifts proved popular, so for Christmas 1965, the company introduced its first building set for retail sale in Germany. In part, it has been claimed to foster education and interest in technology and science among the young. By about 1970, the construction sets were being sold in the United States at upscale toy retailers such as FAO Schwarz.

The original blocks were characteristically gray with red accessories such as wheels and angled blocks. Electric motors, power sources, and gears were soon added to mobilize models. Additional building pieces such as struts were added in “statics” sets, allowing the construction of realistic-looking bridges and tower cranes. A few Fischertechnik girders actually are made of aluminum. Other companies make Fischertechnik-compatible aluminum bars of any desired length. To teach the physics of such models, some sets included measuring devices, so that trigonometric vectors could be calculated and tested.