ASUSTeK Computer Inc. usually referred to as Asus and trading under that name, is a Taiwanese multinational computer hardware and electronics company headquartered in Beitou District, Taipei, Taiwan. Its products include desktops, laptops, netbooks, LED/LCD panels, mobile phones, networking equipment, monitors, motherboards, graphics cards, optical storage, multimedia products, servers, workstations, and tablet PCs. The company's slogan/tagline was "Inspiring Innovation. Persistent Perfection." and is currently "In Search of Incredible.".

Asus is the world's fifth-largest PC vendor by 2013 unit sales (after Lenovo, HP, Dell and Acer).Asus appears in BusinessWeek's "InfoTech 100" and "Asia's Top 10 IT Companies" rankings, and it ranked first in the IT Hardware category of the 2008 Taiwan Top 10 Global Brands survey with a total brand value of US$1.3 billion.

Asus has a primary listing on the Taiwan Stock Exchange and a secondary listing on the London Stock Exchange.