ASUSTeK Computer Incorporated (ASUS), a Taiwan-based multinational company, produces motherboards, graphics cards, optical drives, PDAs, computer monitors, notebook computers, servers, networking products, mobile phones, computer cases, computer components, and computer cooling systems.

Commonly called by its brand name ASUS (pronounced ah-SOOS ] and commonly mispronounced as ay-sus), it is listed on both the London Stock Exchange (LSE: ASKD) and the Taiwan Stock Exchange (TSE: 2357). In 2007, one in three desktop PCs sold used an ASUS motherboard; and the company's 2007 revenues reached US$6.9 billion.

ASUS appears in BusinessWeek’s InfoTech 100 and Asia’s Top 10 IT Companies rankings. It is the number one in quality and service according to Wall Street Journal Asia and leads the IT Hardware category of the 2008 Taiwan Top 10 Global Brands survey with a total brand value of US$1.324 billion.