The LynxOS RTOS is a Unix-like real-time operating system from LynuxWorks (formerly Lynx Real-Time Systems ). Sometimes known as the Lynx Operating System, LynxOS features POSIX compliance and, more recently, Linux compatibility. LynxOS is mostly used in embedded systems in applications for avionics, aerospace, the military, process control and telecommunications.

The first versions of LynxOS were written in 1986 in Dallas, Texas and targeted a custom-built Motorola 68010 processor. In 1988-1989, LynxOS was ported to the Intel 80386 architecture. Around 1989, Application binary interface compatibility with System V was added. Compatibility with other operating systems, including Linux, followed. ARM_architecture and PowerPC architectures are also supported.

In 2003, LynuxWorks introduced a specialized version of LynxOS called LynxOS-178, especially for use in avionics applications that require certification to industry standards such as DO-178B.

The Usenet newsgroup comp.os.lynx is devoted to discussion of LynxOS.

= External link =