| Name | Date | Location | Deaths | Perpetrators | Notes |
| May 2011 Homs massacre | 6-29 May 2011 | Homs | 58 | Syrian Army | Syrian Army allegedly killed 58 civilian protesters during the month of May in 2011. |
| December 2011 Jabal al-Zawiya massacres | 19–20 December 2011 | Jabal Zawiya | 120 | Syrian Army | 120 Syrian Army defectors allegedly massacred by the government. |
| Karm al-Zeitoun massacre | 9 March 2012 | Karm al-Zeitoun, Homs | 47 | Syrian Army | Syrian Army reportedly massacred 47 people after entering Karm al-Zeitoun. |
| Taftanaz massacre | 5 April 2012 | Taftanaz, Idlib Governorate | 62 | Syrian Army | Syrian Army reportedly carried out a massacre by rounding up and executing people following the Battle of Taftanaz. |
| Houla massacre | 25 May 2012 | Houla | 108 | Disputed | 49 children among the dead. Various international media outlets reported that the Syrian government had committed the massacre based on witness/survivor testimonies. The UN concluded that Syrian government forces were responsible. However, after eyewitness accounts published by German paper Frankfurter Allgemeine Zeitung and Russian-affiliated outlet ANNA News gave contradicting accounts, claiming that it was the rebels who committed the massacre, and that the victims' families were warned by the rebels not to speak freely and publicly about the event. UNHRC later concluded that there was insufficient evidence to determine who had committed the massacre. |
| Al-Buwaida al-Sharqiya massacre | 31 May 2012 | Al-Buwaida al-Sharqiya | 13 | Syrian government forces | According to sources, 13 factory workers had been rounded up and shot dead by pro-government forces. |
| Al-Qubair massacre | 6 June 2012 | Al-Qubair, in Maarzaf | 80–100 | Syrian Army | Victims were stabbed and shot. |
| Daret Azzeh massacre | 22 June 2012 | Darat Izza | 25 | Rebels | Rebels claim to have killed 25 men who they accused of being a part of the Shabiha. |
| Siege of Hama | 31 July – 4 August 2012 | Hama | 100–200 | Syrian Army | Syrian government forces assaulted the city of Hama to crack down on the opposition, leading to the deaths of up to 200 civilians. |
| Darayya massacre | 20–25 August 2012 | Darayya, Rif Dimashq | 320–500 | Syrian Army | Many people were killed in a five-day Army assault on the town, which the rebel army had surrendered. According to the opposition, Human Rights Watch and some local residents the killings were committed by the Syrian military and Shabiha militiamen. According to the government and some local residents they were committed by rebel forces. |
| Maarrat Al-Nu'man massacre | 8 – 13 October 2012 | Maarrat al-Nu'man | 65 | Syrian Army | During the Battle of Maarrat Al-Nu'man, the Syrian Army reportedly executed 65 people, including 50 defecting soldiers. |
| Aqrab massacre | 11 December 2012 | Aqrab, Hama Governorate | 125—300 | Rebels | An Alawite village attacked by Syrian rebels with bombs. |
| Basatin al-Hasawiya massacre | 15 January 2013 | Homs | 106 | Syrian Army | Syrian government troops stormed the village of Basatin al-Hasawiya on the outskirts of Homs city reportedly killing 106 civilians. |
| Queiq River massacre | 29 January–14 March 2013 | Queiq River, Aleppo | 147–230 | Syrian Army | Between 29 January and 14 March 2013, opposition activists claimed that they found about 230 bodies on the banks and in the Queiq river in Aleppo. They accused government forces of being the ones who executed the men since the bodies came down the river from the direction of government-held areas of the city. The Syrian government denied responsibility, blaming the massacre instead on Al-Qaeda. Human Rights Watch was able to identify the names of at least 147 victims, all male and aged between 11 and 64, but did not assign definitive blame. It did assert a high likelihood that they occurred in government-held areas based on where the victims were last seen. |
| Tadamon massacre | 16 April 2013 | Tadamon, Damascus, Syria | 41-280+ | Syrian Army | The Tadamon massacre happened in April 2013 in the Tadamon district of Damascus during the Syrian civil war. Syrian soldiers from Military Intelligence 227 killed 41 civilians near the Ottoman Mosque. The victims were executed individually and buried in mass graves. |
| Battle of Jdaidet al-Fadl | 16–21 April 2013 | Rif Dimashq | 100–300 | Syrian Army | Syrian Army was accused by the opposition of carrying out a massacre. SOHR claimed that 250 people were killed since the start of the battle, with them being able to document, by name, 127 of the dead, including 27 rebels. Another opposition claim put the death toll at 450. One activist source claimed he counted 98 bodies in the town's streets and 86 in makeshift clinics who were summarily executed. Another activist stated they documented 85 people who were executed, including 28 who were killed in a makeshift hospital. |
| Bayda and Baniyas massacres | 2–3 May 2013 | Bayda and Baniyas, Tartus Governorate | 128–450 | Alawite militias | Assault by Alawite militias against the local Sunni population. |
| Hatla massacre | 11 June 2013 | Hatla, Deir el-Zour | 60 | Rebels | Shiite villagers killed by Syrian rebels. |
| Khan al-Assal massacre | 22 July 2013 | Khan al-Asal, Aleppo | 51-123+ | Rebels | Rebels executed 51–123 POWs and Civilians. |
| Tell Aran and Tell Hasel massacre | 27–30 July 2013 | Aleppo Governorate | 50–70 |  Islamic Statehs|00190hs|00281hs|00032hs|00700
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