Waldemar Maximilian Nestor (12 December 1888 – 27 July 1941) was the first Roman Catholic priest known to have been murdered in World War II in Yugoslavia.The Holy See started the process of beatification on 21 December 2014 of Nestor and three other priests of the Diocese of Banja Luka who were murdered during the Second World War, Juraj Gospodnetic, Antun Dujlovic and Krešimir Barišic.