|Full name||Arkadiusz Onyszko|
|Date of birth||12 January 1974|
|Place of birth||Lublin, Poland|
|Height||1.87 m (6 ft 1 1⁄2 in)|
|1993–1994||→ Polonia Warsaw (loan)||13||(0)|
|* Senior club appearances and goals counted for the domestic league only and correct as of 4 June 2010.
‡ National team caps and goals correct as of 4 June 2010
He began his career in 1989 with KS Lublinianka. In 1998, he moved to Viborg FF from Widzew Łódź and established himself as Viborg's number one goalkeeper. In 2003, he transferred to Odense Boldklub, where he spent the next six years as OB's first choice goalkeeper. Between 1998 and 2009 he played 363 games in the Danish Superliga, which makes him the 5th most capped player and the most capped foreigner.
After a turbulent time in Denmark, Onyszko returned to Poland and on 13 January 2010 signed a short-term contract with Odra Wodzislaw. The club came last in the league this season and were relegated, but Onyszko's displays were impressive enough to earn him a 2-year contract with Polonia Warsaw, which he signed in May 2010. However, in June 2010 Onyszko was diagnosed with kidney failure.
On January 6, 2013 Onyszko had a kidney transplant in Szczecin.
In June 2009, Onyszko was convicted on charges of assaulting his former wife and sentenced to three months imprisonment, of which two months would be suspended. His club fired him the very same day.
A few days later he signed a contract with Danish club FC Midtjylland. He was fired on 2 November after the release of his autobiography, which contained attacks on homosexuals and female sport reporters.
- "Onyszko har skrevet under" [Onyszko has signed]. bold.dk (in Danish). 2010-01-13. Retrieved 2016-04-30.
- "Onyszko podpisał kontrakt z Polonią Warszawa" [Onyszko has signed a contract with Polonia Warsaw]. sport.interia.pl (in Polish). 2010-05-20. Retrieved 2016-04-30.
- Maciejewski, Tomasz (2013-01-17). "Były bramkarz reprezentacji: Wreszcie mogę się wysiusiać" [The former goalkeeper: Finally, I can pee]. Sport.pl (in Polish). Retrieved 2016-04-30.
- "Danish union denies currently helping controversial keeper". FIFPro World Players' Union. 2009-11-04. Retrieved 2016-04-30.
- "Danish club fires footballer for 'I hate gays' comment". PinkNews. 2009-11-03. Retrieved 2016-04-30.
- "Zróbmy coś z homo- oraz transfobią w sporcie!" [Let's do something about homophobia and transphobia in sports!]. queer.pl (in Polish). 2011-12-19. Retrieved 2016-04-30.