ALT Linux is a set of Russian operating systems based on RPM Package Manager (RPM) and built on a Linux kernel and Sisyphus package repository. ALT Linux has been developed collectively by ALT Linux Team developers community and ALT Linux Ltd.

ALT Linux Team arose from the merger of IPLabs Linux Team and the Linux community of the Institute of Logic, Cognitive Science and Development of Personality. The latter cooperated with Mandrake Linux and SUSE Linux teams to improve localization (specifically Cyrillic script), producing a Linux-Mandrake Russian Edition (RE).

Mandrake and Mandrake RE became different distributions and thus the decision was made to create a separate project. The name ALT was coined, which is a recursive acronym meaning ALT Linux Team.

The split led to the creation of the Sisyphus package repository, which is an unstable branch of the ALT Linux development. In 2007, the Sisyphus repository won a prestigious CNews award in nomination for Information Security.

Linux-Mandrake 7.0 Russian Edition, released in the beginning of 2000, was the first de facto independent distribution of IPLabs Linux Team. It kept the name Mandrake with permission from Mandrake developers.

Spring 2001 was the second IPLabs Linux team release, released several months later.

Since the summer of 2001, ALT Linux Team has been formed and the ALT Linux name has been established.

The first ALT Linux release was ALT Linux Junior 1.0, released in summer of 2001, followed by the updated ALT Linux Junior 1.1 in autumn of 2001.