Sebastian Kóša (born 13 September 2003) is a Slovak professional footballer who plays as a centre-back for Spanish club Real Zaragoza and Slovakia national team.
Kóša made his professional Fortuna Liga debut for Nitra against ViOn Zlaté Moravce on 13 June 2020.
Kóša joined Spartak Trnava on 18 July 2020. He scored his first league goal against AS Trenčín the same year on 25 October, breaking Josef Adamec's record as Spartak Trnava's youngest goalscorer at the age of 17 years, 1 month, and 11 days. In February 2022, Kóša was named the Best Player of Slovakia in the U19 category at Grassroots Football Gala hosted by the Slovak Football Association.
On 24 August 2024, Kóša signed a four-year contract with Spanish Segunda División side Real Zaragoza.
At the age of 17 in 2021, Kóša became the youngest player of the Slovakia U21 national team, playing the full match against Lithuania and Northern Ireland.
