Jakub Kosakowski (born 7 January 2002) is a Polish chess grandmaster (2025).
Jakub Kosakowski has won medals at the Polish Youth Chess Championships five times: gold in Poronin in 2012 (U10 age group), gold in Suwaà Âki in 2015 (U14 age group), silver in Ustroà  in 2017 (U16 age group), gold in JastrzÃÂbia Góra in 2018 (U16 age group), and silver in Szklarska PorÃÂba in 2020 ([U18 age group).
Jakub Kosakowski has won eight medals at the Polish Youth Rapid Chess Championships, including six gold medals: Warsaw in 2011 (U10 age group), Olszytyn in 2013 (U12 age group), Wrocà Âaw in 2014 (U12 age group), Koszalin in 2016 (U14 age grou), Wrocà Âaw in 2017 - (U16 age group), and Wrocà Âaw in 2018 (U16 age group). He has also won five medals at the Polish Youth Blitz Chess Championships, including two gold medals: Wrocà Âaw in 2014 (U12 age group), and Koszalin in 2016 (U14 age group). He represented Poland at World Youth Chess Championships (2 times) and European Youth Chess Championships (2 times), achieving his best result in 2015 in Poreà(13th place at the European Youth Chess Championship in the U14 age group).
In 2022, Kosakowski won the silver medal at the Polish Blitz Chess Championship. In May 2024, he ranked 8th at the Polish Chess Championship.
Jakub Kosakowski has been among the winners in the following tournaments: