Oskar Stachnik (born 1 March 1998) is a Polish discus thrower.

He is studying at the Maria Curie-Skłodowska University.

He won a silver medal at the 2016 IAAF World U20 Championships[1] and gold at the 2017 European Athletics U20 Championships.

[2] He won also a bronze medal at the 2019 European Athletics U23 Championships[3] and a gold medal at the 2021 Summer World University Games.

[4]