LUnix (little UNIX) is an operating system for the Commodore 64, a popular home computer of the 1980s. It supports TCP/IP networking (SLIP or Point-to-Point_Protocol using an RS232 interface). LUnix aims to look and feel like UNIX. Unlike most Unix-like systems, LUnix is written in 6502 assembly language instead of C (though there is a compiler for a subset of the language, called cc65).

LUnix should not be confused with Linux, to which it bears just a subtle relation.

OS-9 was similarly written (commercially by MicroWare) as a UNIX-like operating system, implemented in native-code not C, for the 6809 microprocessor.

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