FLIR Systems (NASDAQ: FLIR) is a thermal imaging (infrared) systems manufacturer based in Wilsonville, Oregon, United States. Founded in 1978, the company makes thermal imagers, thermal imager components, as well as larger systems containing thermal imagers along with other sensors, for both commercial and military applications. FLIR is a component of the S&P 500 index with annual revenues in excess of USD 1 billion annually as of 2009. The company has had several accounting scandals concerning back dating of stock options and claims of fraudulent accounting. As of 2009, Earl R. Lewis is the chief executive officer, chairman of the board, and president of the company that employs 1,900 people worldwide.

FLIR took its name from the acronym for forward-looking infrared imaging systems. The company began in 1978 with airborne IR systems, and developed from 1978 to 2004 through product development and acquisitions of related companies. Originally based in Tigard, Oregon, the company relocated to Portland in the mid-1990s. FLIR teamed up with Hughes Aircraft Company in 1990, with Hughes taking part ownership of FLIR.