Werner Almesberger (born 13 August 1967) is an Austrian free software computer programmer and an open-source hardware designer/maker.
He is mainly known as a hacker of the Linux kernel.
Contributions to Linux (free software projects) include the LILO boot loader, the initial RAM disk (initrd), the MS-DOS file system, much of the ATM code, the tcng traffic control configurator, the UML-based simulator umlsim, and the Openmoko (a version of Linux for completely open, low-cost, high-volume phones).