ASUSTek Computer Inc. (stylized as ASUSTeK or ASUS) is a Taiwanese multinational computer and phone hardware and electronics company headquartered in Beitou District, Taipei, Taiwan. Its products include desktop computers, laptops, netbooks, mobile phones, networking equipment, monitors, wi-fi routers, projectors, motherboards, graphics cards, optical storage, multimedia products, peripherals, wearables, servers, workstations, and tablet PCs. The company is also an original equipment manufacturer (OEM).

Asus is the world’s 5th-largest PC vendor by unit sales as of January 2021. 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 $1.3 billion.