| City | Country | Year | Type of attack | Target | Number of casualties | Carried out by |
|---|---|---|---|---|---|---|
| Lockerbie | United Kingdom | 1988 | Bombing/Explosion | Boeing 747 Aircraft | 270 | Libya |
| Paris | France | 2015 | Hostage Taking (Kidnapping) | Concert Hall | 92 | Islamic State of Iraq and the Levant (ISIL) |
| Athens | Greece | 1974 | Bombing/Explosion | Boing 707 Acft en route Tel Aviv to New York | 88 | Popular Front for the Liberation of Palestine, Gen Cmd (PFLP-GC) |
| Bologna | Italy | 1980 | Bombing/Explosion | Central Station (RR) | 76 | Armed Revolutionary Nuclei (NAR) |
| Madrid | Spain | 2004 | Bombing/Explosion | Indiscriminate civilians on commuter trains in Madrid, Spain. | 73 | Abu Hafs al-Masri Brigades |
| Utoya | Norway | 2011 | Armed Assault | Civilians | 69 | Anders Behring Breivik |
| Madrid | Spain | 2004 | Bombing/Explosion | Indiscriminate civilians on commuter trains in Madrid, Spain. | 62 | Abu Hafs al-Masri Brigades |
| Athens | Greece | 1985 | Hijacking | Jetliner Flight 648 | 60 | Abu Nidal Organization (ANO) |
| Zurich | Switzerland | 1970 | Bombing/Explosion | Swiss Air DC-9 | 47 | Popular Front for the Liberation of Palestine, Gen Cmd (PFLP-GC) |
| London | United Kingdom | 1980 | Facility/Infrastructure Attack | Nightclub | 37 | John Thompson |
| Madrid | Spain | 2004 | Bombing/Explosion | Indiscriminate civilians on commuter trains in Madrid, Spain. | 37 | Abu Hafs al-Masri Brigades |
| Rome | Italy | 1973 | Hostage Taking (Barricade Incident) | Pan Am Lounge and Loading Pan Am 707 | 30 | Black September |
| Omagh | United Kingdom | 1998 | Bombing/Explosion | Civilians in Omagh, Northern Ireland | 29 | Real Irish Republican Army (RIRA) |
| London | United Kingdom | 2005 | Bombing/Explosion | Number 216 Train | 27 | Secret Organization of al-Qaida in Europe |
| Dublin | Ireland | 1974 | Bombing/Explosion | 26 civilians | 26 | Ulster Volunteer Force (UVF) |
| Madrid | Spain | 2004 | Bombing/Explosion | Indiscriminate civilians on commuter trains in Madrid, Spain. | 19 | Abu Hafs al-Masri Brigades |
| Paris | France | 2015 | Armed Assault | Bar | 19 | Islamic State of Iraq and the Levant (ISIL) |
| Warrenpoint | United Kingdom | 1979 | Bombing/Explosion | army truck | 18 | Irish Republican Army (IRA) |
| Aporto | Spain | 1985 | Bombing/Explosion | El Descanso restaurant | 18 | Hezbollah |
| Munich | West Germany (FRG) | 1972 | Assassination | Israeli Olympic Team | 16 | Black September |
| Nicosia | Cyprus | 1978 | Assassination | Youssef Sebai | 16 | Unaffiliated Individual(s) |
| Ballykelly | United Kingdom | 1982 | Bombing/Explosion | Droppin Well Pub (discotheque) | 16 | Irish National Liberation Army (INLA) |
| Rome | Italy | 1985 | Bombing/Explosion | Check in desk of El Al Airlines | 16 | Abu Nidal Organization (ANO) |
| Belfast | United Kingdom | 1971 | Bombing/Explosion | 15 Catholics | 15 | Ulster Volunteer Force (UVF) |
| Florence | Italy | 1984 | Bombing/Explosion | Express Train (14 Coach Naples-Milan) | 15 | New Order |
| Barcelona | Spain | 1987 | Bombing/Explosion | Parking Garage | 15 | Basque Fatherland and Freedom (ETA) |
| Paris | France | 2015 | Armed Assault | Restaurants | 15 | Islamic State of Iraq and the Levant (ISIL) |
| London | United Kingdom | 2005 | Bombing/Explosion | Number 30 Bus | 14 | Secret Organization of al-Qaida in Europe |
| Belfast | United Kingdom | 1978 | Bombing/Explosion | Restaurant Lamon House | 14 | Irish Republican Army (IRA) |
| Zug | Switzerland | 2001 | Armed Assault | Zug Canton Assembly building | 14 | Friedrich Leibacher |
| Athens | Greece | 1976 | Hijacking | Airbus A-300 | 13 | Palestine Liberation Organization (PLO) |
| Munich | West Germany (FRG) | 1980 | Bombing/Explosion | unknown | 13 | Neo-Nazi Group |
| Batley | United Kingdom | 1974 | Bombing/Explosion | British Military Bus | 12 | Irish Republican Army (IRA) |
| Bologna | Italy | 1974 | Bombing/Explosion | Tome to Munich Express train | 12 | Black Order |
| Madrid | Spain | 1974 | Bombing/Explosion | Cafe Rolando | 12 | Basque Fatherland and Freedom (ETA) |
| Paris | France | 2015 | Hostage Taking (Barricade Incident) | Offices | 12 | Al-Qaida in the Arabian Peninsula (AQAP) |
| Brescia | Italy | 1974 | Bombing/Explosion | Leftist Meeting | 11 | Black Order |
| Enniskillen | United Kingdom | 1987 | Bombing/Explosion | Remembrance Day Celebration | 11 | Irish Republican Army (IRA) |
| Zaragoza | Spain | 1987 | Bombing/Explosion | Civil guard family housing | 11 | Basque Fatherland and Freedom (ETA) |
| Deal | United Kingdom | 1989 | Bombing/Explosion | barracks, Royal Marines School of Music | 11 | Irish Republican Army (IRA) |
| Birmingham | United Kingdom | 1974 | Bombing/Explosion | 2 Pubs | 10 | Irish Republican Army (IRA) |
| Kingsmill | United Kingdom | 1976 | Assassination | Ten Protestants in minibus | 10 | Republican Action Force |
| Rome | Italy | 1980 | Bombing/Explosion | Turkish Airlines Offices | 10 | Armenian Secret Army for the Liberation of Armenia |
| Aegina | Greece | 1988 | Armed Assault | City of Porras Ferry | 10 | Hezbollah |
| Tuusula | Finland | 2007 | Armed Assault | Students and teachers in the Jokela High School | 9 | Unaffiliated Individual(s) |
| Claudy | United Kingdom | 1972 | Bombing/Explosion | nine civilians | 9 | Irish Republican Army (IRA) |
| Madrid | Spain | 1977 | Armed Assault | Su source document, Lawyers | 9 | Argentine Anticommunist Alliance (AAA) |
| Marseilles | France | 1978 | Armed Assault | 9 | unidentified attackers | |
| Donegal | Ireland | 1980 | Facility/Infrastructure Attack | Hotel | 9 | Irish Republican Army (IRA) |
| Newry | United Kingdom | 1985 | Bombing/Explosion | Ulster police base | 9 | Irish Republican Army (IRA) |