Tektronix, Inc., historically commonly known as Tek, is an American company best known for manufacturing test and measurement equipment such as oscilloscopes, logic analyzers, and video and mobile test protocol equipment.

Originally an independent company, it is now a subsidiary of Fortive, a spin-off of Danaher Corporation.

The company has its origins in the electronics revolution that immediately followed the Second World War. It was founded in December 1945 as Tekrad. In 1972 she developed a terminal, the Tektronix 4010. A striking feature was the use of a storage CRT, which minimized the expensive memory. Shortly afterwards, she developed a full-fledged computer with the Tektronix 4050 series.

On November 21, 2007, Tektronix was acquired by Danaher Corporation.