Siemaszko is a Polish surname of East Slavic origin, the Polish transliteration of the surname Semashko. Notable people with the surname include:
Artur Siemaszko (born 1997), Polish footballer Casey Siemaszko (born 1961), American actor Ewa Siemaszko (born 1947), Polish writer, publicist and lecturer Nina Siemaszko (born 1970), American actress Rafał Siemaszko (born 1986), Polish footballer Władysław Siemaszko (1919–2025), Polish publicist and lawyer, member of the Polish resistance Armia Krajowa
See also
pl:Siemaszko