Mutassim Gaddafi
| Mutassim Gaddafi المعتصم القذافي | |
|---|---|
| Mutassim Gaddafi in April 2009 | |
| National Security Advisor of Libya | |
| In office 2008–2011 | |
| Preceded by | Position established | 
| Succeeded by | Position abolished | 
| Personal details | |
| Born | 18 December 1974 Tripoli, Libyan Arab Republic | 
| Died | 20 October 2011 (aged 36) Sirte, Libyan Arab Jamahiriya (now Libya) | 
| Cause of death | Gunshot wounds | 
| Resting place | In an unknown location in the Libyan Desert | 
| Domestic partner | Vanessa Hessler (2007–2011) | 
| Military service | |
| Allegiance | Libyan Arab Jamahiriya | 
| Branch/service | Libyan Army | 
| Years of service | 1990s–2011 | 
| Rank | Lieutenant Colonel | 
| Commands | Brega | 
| Battles/wars | |
Mutassim Billah Gaddafi (Arabic: المُعْتَصِمٌ بِٱللهِ ٱلْقَذَّافِيّ, also transliterated as Al-Moa'tassem Bellah Al-Qaddafi or Al-Mu'tasim Bi'llah al-Qadhafi; 18 December 1974 – 20 October 2011) was a Libyan military officer, and the National Security Advisor of Libya from 2008 until his assassination in 2011. He was the fourth son of former Libyan leader Muammar Gaddafi, and a member of his father's inner circle. He was said to have been in charge of crushing opposition during the Libyan civil war.
Mutassim was captured by anti-Gaddafi rebel forces during the Battle of Sirte, in the First Libyan Civil War, and killed along with his father.