| Position: | Point guard |
| Height M: | 1.91 |
| Birth Date: | 1997 6, mf=yes |
| Birth Place: | Ljubljana, Slovenia |
| Nationality: | Slovenian |
| Draft Year: | 2019 |
| Career Start: | 2013 |
| Career End: | 2023 |
| Years1: | 2013–2015 |
| Team1: | Union Olimpija |
| Years2: | 2014–2015 |
| Team2: | → Škofja Loka |
| Years3: | 2015–2016 |
| Team3: | Cibona |
| Years4: | 2017–2018 |
| Team4: | Ilirija |
| Years5: | 2018–2019 |
| Team5: | Koper Primorska |
| Years6: | 2019–2023 |
| Team6: | Bayern Munich |
| Years7: | 2023 |
| Team7: | CB Breogán |
| Highlights: |
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Žan Mark Šiško (born June 29, 1997) is a retired Slovenian professional basketball player.[1] Standing at, he played at the point guard position.
Šiško began his professional career with Slovenian powerhouse Union Olimpija, making his official debut in March 2014 at the age of 16.[2]
During the 2015–16 season, he was part of Croatian team Cibona. On November 1, 2015, Šiško made his ABA League debut in a game against Igokea, finishing the game with 11 points and 3 assists. He saw court during 12 games and averaged 2.9 points and 2 assists.
On December 28, 2019, Šiško signed a contract with German club Bayern Munich.[3]
In July 2022, Šiško extended his contract with Bayern for another two years.[4] In November 2022, he was sidelined from the team for personal reasons for the rest of the season.[5]
On June 21, 2023, Šiško moved to Spanish club CB Breogán.[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.[7]