Radion Dmytrovych Posyevkin (; born 18 May 2001) is a Ukrainian professional football midfielder who plays for Nyva Ternopil.
Born in Poltava Oblast, Posyevkin is a product of local Kremin Kremenchuk youth sportive school system.
In August 2018 he was signed by Vorskla Poltava. He made his debut as a second half-time substituted player for Vorskla Poltava in the Ukrainian Premier League in an away drawing match against FC Lviv on 3 July 2020.
On 31 August 2024, Posyevkin signed with Nyva Ternopil.