| Position: | Power forward |
| Height M: | 2.05 |
| Birth Date: | 1995 4, mf=yes |
| Birth Place: | Postojna, Slovenia |
| Nationality: | Slovenian |
| League: | Belgian League |
| Team: | Belfius Mons-Hainaut |
| Number: | 55 |
| Draft Year: | 2017 |
| Career Start: | 2012 |
| Years1: | 2012–2014 |
| Team1: | UKK Koper |
| Years2: | 2014–2016 |
| Team2: | Helios Suns |
| Years3: | 2016 |
| Years4: | 2016–2019 |
| Team4: | Rogaška |
| Years5: | 2019–2020 |
| Team5: | Helios Suns |
| Years6: | 2020 |
| Team6: | Olomoucko |
| Years7: | 2020–2021 |
| Team7: | Rogaška |
| Years8: | 2021–2022 |
| Team8: | Helios Suns |
| Years9: | 2022–2023 |
| Team9: | Zadar |
| Years10: | 2023–present |
| Team10: | Belfius Mons-Hainaut |
| Highlights: |
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Leon Šantelj (born April 25, 1995) is a Slovenian professional basketball player for Belfius Mons-Hainaut of the Belgian League. He is a 2.05 m tall Power forward.
Šantelj began the 2020-21 season with BK Olomoucko of the Czech National Basketball League, averaging 9.0 points and 4.3 rebounds per game in six games. On November 1, 2020, he signed with Rogaška.[1]
On 21 July 2022, Šantelj signed a one-year contract with Croatian club Zadar of the ABA League.[2]
Šantelj made his debut for the Slovenian national team on February 22, 2019, at the 2019 FIBA Basketball World Cup qualification game against Turkey national team.[3]