Semashko is an East Slavic surname originated from a diminutive for the given name Semyon (Simeon). The Belarusian-language spelling is Syamashka.
Spelled in Polish as Siemaszko, it was a surname of nobility in Poland (Siemaszko of Łabędź coat of arms, officially recorded in Volyn Governorate[1])
Notable people with the surname include: