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Bus Beloyar (Бус Белояр) was a hypothetical, possibly mythical Slavic kniaz who ruled Ruskolan (Русколань) state (also mythical) and fought against Huns in east, Romans in south and Germans in West, against Goths' king Hermanarich, and was eventually crucified by Goths.

This legend is related to a hypothesis that relates the origins of the Rus' nationality to the Sarmatian tribe of Roxolani.

The name Bus is mentioned in Tale of Igor's Campaign as [They] Sing to Bus' time.