Eleni-Klaoudia Polak (; born 9 September 1996) is a Greek athlete specialising in the pole vault. She represented her country at one outdoor and two indoor European Championships.
Polak was born in Greece to a Polish father and a Sri Lankan mother.
Her personal bests in the event are 4.70 metres outdoors (Athens 2020) and 4.71 metres indoors (Piraeus 2021).
On 6 August 2024, Polak received a provisional suspension following an adverse analytical finding and retroactivly disqualifed from the Paris 2024 Olympic Games. In November 2025, she was issued with a four-year ban to expire in August 2028 by the Hellenic National Council for Combating Doping (EOKAN), who disclosed that the prohibited substance was clenbuterol.
<sup>1</sup> No mark in the final<br> 2 On 6 August 2024 Polak was provisionally suspended due to an Adverse Analytical Finding receiving a DQ according to anti-doping Rule 10.1.