Listed below are the worst disasters in Poland's history, listed by death toll. This list excludes warfare and intentional acts of destruction.
Renard coal mine disaster, 1881, Sosnowiec, around 200 killed
LOT Polish Airlines Flight 5055, 1987 (9 May), Warsaw, 183 killed
Kleofas coal mine disaster, 1896, Katowice (then German Empire), 104 killed
"Barbara-Wyzwolenie" coal mine disaster, 1954 (21 March), Chorzów, 103 killed
Smolensk Tu-154 crash, 2010 (10 April), Smolensk, (Russia), 96 killed, including Polish President Lech Kaczyński
LOT Polish Airlines Flight 007, 1980 (14 March), Warsaw, 87 killed
"Makoszowy" coal mine disaster, 1958 (28 August), Zabrze, 72 killed
Otłoczyn railway accident, 1980 (19 August), near Brzoza Toruńska, 67 killed
Katowice Trade Hall roof collapse, 2006 (28 January), Chorzów, 65 killed
Outdoor Cinema fire, 1955 (11 May), Wielopole Skrzyńskie, 58 killed
Górna Grupa mental hospital fire, 1980 (31 October - 1 November), Górna Grupa, 55 killed
Central European Flood, 1997 (July), western Poland, 55 killed
MS Jan Heweliusz, 1993 (14 January), Baltic Sea (near Rügen Island), 55 killed
LOT Polish Airlines Flight 165, 1969 (2 April), Polica (near Zawoja), 53 killed
Rotunda PKO Bank explosion, 1979 (15 February), Warsaw, 49 killed
1978 Balkan Bulgarian Tupolev Tu-134 crash, 1978 (16 March), Gabare (Bulgaria), 39 Poles killed (out of 73 total fatalities)
Czechowice-Dziedzice Refinery fire, 1971 (26–27 June), Czechowice-Dziedzice, 37 killed
1962 LOT Vickers Viscount Warsaw crash, 1962 (19 December), Warsaw, 33 killed
PKS Gdańsk bus crash, 1994 (2 May), Gdańsk-Kokoszki, 32 killed
Wilczy Jar buses tragedy, 1978 (15 November), Wilczy Jar (n. Żywiec-Oczków), 30 killed
Grenoble coach crash, 2007 (22 July), Vizille (France), 27 killed
Julianka rail crash, 1976 (3 November), Julianka (n. Częstochowa), 25 killed
Osieck rail crash, 1981 (4 June), Osieck, 25 killed
MS Busko Zdrój, 1985 (8 February), North Sea, 24 killed
Kamień Pomorski homeless hostel fire, 2009 (13 April), Kamień Pomorski, 23 killed
Halemba coal mine disaster, 2006, 2006 (22 November), Ruda Śląska, 23 killed
MS Maria Konopnicka fire in Stocznia Gdańska, 1961 (13 December), 23 killed
Wojska Polskiego 39 Street gas explosion, 1995 (17 April), Gdańsk, 22 killed
Mirosławiec air accident crash, 2008 (23 January), Mirosławiec, 20 killed
MS Kudowa Zdrój, 1983 (20 January), Mediterranean, 20 killed
Wujek-Śląsk coal mine disaster, 18 September 2009, Ruda Śląska- a methane explosion killed 12 in the coal mine and a further 8 would die in the hospital
Balaton coach crash, 2002 (1 July), n. Balaton (Hungary), 19 killed
Halemba coal mine disaster, 1990 (10 January), Ruda Śląska, 19 killed
Biały Jar, 1968 (20 March), Biały Jar (n. Karpacz), 19 killed
Nowe Miasto nad Pilica bus crash, 2010 (12 October), Nowe Miasto nad Pilica, 18 killed
"Mysłowice" coal mine disaster, 1987 (4 February), Mysłowice, 18 killed
B406/6 trawler explosion in Stocznia Gdańska, 1980 (18 June), Gdańsk, 18 killed
Motława, 1975 (1 August), Gdańsk, 18 killed
M/v "Nysa", 1965 (10 January), North Sea, 18 killed
Polish Air Force An-24 crash, 1973 (28 February), Szczecin airport 18 killed
Struga 12 street gas explosion, 1976 (1 February), Gdańsk, 17 killed
Szczekociny rail crash, 2012 (3 March), Szczekociny, killed 16
Ursus rail crash, 1990 (20 August), Ursus (n. Warsaw), 16 killed
Radkowice rail crash, 1973 (27 August), Radkowice, 16 killed
Osiecznica bus crash, 1978 (22 January), n. Osiecznica, 15 killed
Wyszaka streetcar crash, 1967 (7 December), Szczecin, 15 killed
Brandenburg coach crash, 2010, (26 September), Schonefeld (Germany), 14 killed
"Kaskada" restaurant fire, 1981 (27 April), Szczecin, 14 killed
MS Czubatka, 1955 (10 May), North Sea, 14 killed
Izbicko level crossing accident, 1960, (6 January), Izbicko, 13 killed
Storm in Mazury, 2007 (21 August), Mazury (north-eastern Poland), 12 killed
Jeżewo coach crash, 2005 (30 September), Sikory-Wojciechowięta (n. Stare Jeżewo), 12 killed
Reptowo rail crash, 1997 (5 May), Reptowo (n. Szczecin), 12 killed
Bydgoszcz rail crash, 1972 (3 June), Śliesin (n. Bydgoszcz), 12 killed
MS Cyranka, 1956 (4 October), North Sea, 12 killed
Psie Pole rail crash, 1977 (9 July), Mirkowo (n. Wrocław), 11 killed (unofficial - 32 killed)
"Jas-Mos" coal mine disaster, 2002 (10 February), 10 killed
Ministry of Interior MSWiA helicopter crash, 1991 (10 January), n. Cisna, 10 killed
Drogomil level crossing accident, 1988 (4 June), Drogomil (n. Bytom Odrzański), 10 killed
Piła rail crash, 1988 (19 May), Piła, 10 killed
MS Brda, 1975 (10 January), Hanstholm (Denmark), 10 killed
"Rokitnica" coal mine disaster, 1971 (23 March), Zabrze, 10 killed
Agricultural University building collapse, 1966 (22 March), Wrocław, 10 killed
Bratoszewice level crossing collision, 2012 (30 July), 9 killed.
Dzerzhinsky 6 Street gas explosion, 1983 (7 December), Łódź, 8 killed
2008 Poland tornado outbreak, 2008 (15 to 16 August), 4 killed
List of disasters in Poland by death toll Wikipedia (Text) CC BY-SA