The client version of the OS/2 operating system. It includes peer-to-peer networking, fax and communications programs, multimedia viewing and editing applications and IBM Works (word processing, spreadsheet, database and other office tools).

Introduced in late 1994 as Version 3.0 of OS/2, it was the successor to OS/2 for Windows and OS/2 Version 2.1. When first introduced, it could run in 8MB of memory, which was important for its time. The last update of OS/2 Warp from IBM was Version 4.52, which was released in 2001.

There were originally two versions of OS/2 Warp. One required Windows 3.1 to be installed, the other included a modified version of Windows 3.1. See OS/2.