Arkadiusz Jerzy Onyszko (born 12 January 1974) is a Polish former professional footballer who played as a goalkeeper.

After a turbulent time in Denmark, Onyszko returned to Poland and signed a short-term contract with Odra Wodzislaw on 13 January 2010.

[3] The club came last in the league this season and were relegated, but Onyszko's displays were impressive enough to earn him a two-year contract with Polonia Warsaw, which he signed in May 2010.

[5] Onyszko was a member of the Poland national team that won the silver medal at the 1992 Summer Olympics in Barcelona, Spain.

He was fired on 2 November after the release of his autobiography, which contained attacks on homosexuals and female sport reporters.