Siim-Markus Post (born 13 February 1997) is an Estonian professional basketball player for TalTech 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.
This biographical article relating to an Estonian basketball figure is a stub.