Władysław Siemaszko (born 8 June 1919) is a Polish publicist and lawyer, former member of the Polish resistance Armia Krajowa (AK), author of numerous publications focusing on the massacres of Poles in Volhynia. He is the father of writer Ewa Siemaszko, co-author of Ludobójstwo dokonane przez nacjonalistów ukraińskich na ludności polskiej Wołynia 1939–45 (The Genocide Committed by the Ukrainian Nationalists on Polish Citizens of Volhynia in 1939–45) consisting of two volumes of 1500 pages of research.