Slovianski (Словянски and Словјански in Cyrillic) is a Slavic interlanguage, created in 2006 by a group of language creators from different countries. Its purpose is to facilitate communication between representatives of different Slavic nations, as well as to allow people who don't know any Slavic language to communicate with Slavs. For the latter, it can fulfill an educational role as well.

Slovianski can be classified as a semi-artificial language. It has its roots in the various improvized language forms Slavs have been using for centuries to communicate with Slavs of other nationalities, for example in multi-Slavic environments and on the Internet. The purpose of Slovianski is to provide these with a scientific base. Thus, both grammar and vocabulary are based on the commonalities between the Slavic languages, and artificial elements are avoided. Its main focus lies on instant understandability rather than easy learning, which is a feature typical for naturalistic languages.

Slovianski can be written using the Latin and the Cyrillic alphabets.