Oliver Mazurtšak (born 26 August 1993), known professionally as OLLIE, is an Estonian singer, songwriter, guitarist, and record producer. His father is Jüri Mazurtšak, the drummer from the Estonian band, Night Star.
On 2 November 2022, it was announced that he would participate in Eesti Laul 2023 with the song "Venom". He participated in the first semi-final and qualified for the final. In the final, he qualified for the superfinal and eventually came in second place after Alika.
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