Žan Mark Šiško (born June 29, 1997) is a retired Slovenian professional basketball player.

Šiško began his professional career with Slovenian powerhouse Union Olimpija, making his official debut in March 2014 at the age of 16.

[citation needed] On December 28, 2019, Šiško signed a contract with German club Bayern Munich.

[4] In November 2022, he was sidelined from the team for personal reasons for the rest of the season.

[6] On November 24, 2017, Šiško made his debut for the Slovenia national team in the 2019 FIBA Basketball World Cup qualification game against Belarus.