|Full name||Seweryn Daniel Gancarczyk|
|Date of birth||22 November 1981|
|Place of birth||Dębica, Poland|
|Height||1.83 m (6 ft 0 in)|
|Playing position||Left back|
|2004||→ Volyn Lutsk (loan)||19||(0)|
|* Senior club appearances and goals counted for the domestic league only and correct as of 23 July 2015.
‡ National team caps and goals correct as of 19 March 2010
Gancarczyk started to play football in his early teens, in junior teams of Podkarpacie Pustynia. After several seasons there and after a short spell at second Polish division club Hetman Zamość, Gancarczyk made his way to the capital of Ukraine, Kiev, where he joined local Arsenal Kyiv. Having also briefly performed for west Ukrainian club Volyn Lutsk, Gancarczyk was transferred to Metalist Kharkiv, where he has remained since, and has reached a position of vice-captain at the club.
Debuting for his country in 2006 in a 0:1 loss against Lithuania, the defender was named to the 23-men Poland's 2006 World Cup squad for the Cup finals in Germany.
On 14 October 2009, during Poland's last game of the 2010 FIFA World Cup qualifiers against Slovakia, Gancarczyk scored an own goal in the 3rd minute of the game, condemning Poland to a 1–0 defeat and enabling Slovakia to qualify for the World Cup.