| Siim-Markus Post | |
| Position: | Point guard / shooting guard |
| Height M: | 1.84[1] |
| Weight Kg: | 87 |
| League: | Estonian–Latvian Basketball League |
| Team: | BC Pärnu |
| Number: | 5 |
| Nationality: | Estonian |
| Birth Date: | 13 February 1997 |
| Birth Place: | Kohtla-Järve, Estonia |
| Years1: | 2013–2014 |
| Team1: | HITO |
| Years2: | 2012–2013 |
| Team2: | →HITO II |
| Years3: | 2013–2016 |
| Team3: | Audentes/Noortekoondis |
| Years4: | 2013–2016 |
| Years5: | 2016–2017 |
| Team5: | Rakvere Tarvas |
| Years6: | 2017–2020 |
| Team6: | Pärnu Sadam |
| Years7: | 2020–2021 |
| Team7: | Tallinna Kalev |
| Years8: | 2021–2022 |
| Team8: | Pärnu Sadam |
| Years9: | 2022–present |
| Team9: | KK Viimsi |
| Highlights: | |
Siim-Markus Post (born 13 February 1997) is an Estonian professional basketball player for BC Pärnu of the Estonian–Latvian Basketball League. He also represents the Estonian national team. Standing at 1.84 m (6 ft 0 in), he plays at the point guard position.
Post made his debut for the Estonian national team on 26 July 2020, in a 84–67 victory over Latvia.[2]