EOTech is an American company that designs, manufactures, and markets electro-optic products and systems.

EOTech, a division of L-3, delivers cutting edge technology and products in the fields of holographic sighting systems, tactical lasers, illuminators and thermal imaging equipment. The company is dedicated to providing high-quality battle-tested products to law enforcement and commercial markets around the world.

They introduced the first-generation HWS at the 1996 SHOT Show, under the trade name Bushnell-HoloSight®. The HWS was designed to increase target accuracy and speed of target acquisition in sport shooting and hunting applications. It won the Optic of the Year Award from the Shooting Industry Academy of Excellence.

In 1972, the Michigan State Legislature established an independent, non-profit research institute, Willow Runs Laboratories. It was later renamed Environmental Research Institute of Michigan (ERIM). Two decades later, in 1993, ERIM formed Michigan Development Corporation (MDC) to commercialize ERIM technology and create spin-off companies. In 1995, MDC created EOTech as a wholly-owned subsidiary of ERIM.

In November 2005, L-3 Communications acquired EOTech. L-3 is one of the largest defense companies in the U.S. EOTech moved to a larger facility in Ann Arbor, Michigan, in 2007. That year, the company also obtained ISO 9001:2000 registration.