Unisys Corporation (NYSE: UIS) is an American global information technology (IT) company based in Blue Bell, Pennsylvania, USA. The company provides a portfolio of IT services, software, and technology.

Unisys has a long history in the technology industry. The company traces its roots back to the founding of American Arithmometer Company (later Burroughs Corporation) in 1886 and the Sperry Gyroscope Company in 1910. Unisys predecessor companies also include the Eckert–Mauchly Computer Corporation, which invented the world's first large-scale digital computer, the ENIAC, at the University of Pennsylvania.

In September 1986 Unisys was formed through the merger of the mainframe corporations Sperry and Burroughs, with Burroughs buying Sperry for $4.8 billion. The name was chosen in an internal competition when an intern, Charles Ayoub, came up with the UNISYS acronym from United Information Systems. The merger was the largest in the computer industry at the time and made Unisys the second largest computer company with annual revenue of $10.5 billion. At the time of the merger, Unisys had approximately 120,000 employees.