The National Day of Remembrance of Genocide Victims is observed in Poland every July 11. This day honors the memory of Polish victims of massacres committed by Ukrainian nationalists, specifically the Ukrainian Insurgent Army (UPA) and the Organization of Ukrainian Nationalists (OUN), during World War II in regions such as Volhynia and Eastern Galicia. The Polish government officially recognizes these events as genocide, with estimates of 40,000 to 60,000 Poles killed in Volhynia and 30,000 to 40,000 in Eastern Galicia. Established by the Sejm in 2016, the day was originally suggested in 2013 by representatives from four political parties. The name was changed in 2025 to reflect the victims more accurately. Observances typically include memorial activities to honor those who suffered during these tragic events.