Syrian Armed Forces: 180,000[67] General Security Directorate: 8,000[68] National Defense Force: 80,000[69] Ba'ath Brigades: 7,000 Hezbollah: 6,000–8,000[70] Liwa Al-Quds: 4,000–8,000 Russia: 4,000 troops[71] & 1,000 contractors[72] Iran: 3,000–5,000[70][73]
Other allied groups: 20,000+ | Free Syrian Army: 20,000–32,000[74](2013) Islamic Front: 40,000–70,000[75][76](2014) Other groups: 12,500[77](2015) Turkish Armed Forces: 4,000–8,000[78][79]
Ahrar al-Sham: 18,000–20,000+[80][81](March 2017) Tahrir al-Sham: 31,000[82] | 15,000–20,000 (per U.S., late 2016)[83] | SDF: 60,000–75,000 (2017 est.) - YPG & YPJ: 20,000–30,000 (2017 est.)
- Syriac Military Council (MFS): 1,000 (2017 est.)
- Al-Sanadid Forces: 2,000–4,000 (2017 est.)
- SDF Military Councils: 10,000+[87][88][89]
|
Syrian Arab Republic: 65,187–100,187 soldiers killed[90][91] 50,484–64,484 militiamen killed[90][91] 4,700 soldiers/militiamen & 2,000 supporters captured[90] Hezbollah: 1,677–2,000 killed[90][92] Russia: 116 soldiers[93] & 186–280 PMCs killed[94]
Other non-Syrian fighters: 8,109 killed[90](2,300–3,500+ IRGC-led)[95][96] | 132,824–173,824 killed[90][91] Turkey: 182 killed (2016–19 incursions)[97][98][99] | 28,532+ killed (per SOHR)[100] 20,711+ killed (per YPG & SAA)[101][102] | SDF: 11,600–12,586+ killed[103][104] CJTF–OIR: 11 killed[105] |