He was convicted on four charges including conspiracy to provide material support for terrorism, maliciously destroying and injuring dwellings and property as well as using and carrying a semi-automatic weapon during a crime of violence.
Khattala faces up to 60 years in prison.
He was captured by US special forces in Libya in 2014.
Ahmed Abu Khattala
• Native of Benghazi in eastern Libya
• Construction worker by trade
• Spent several years in Col Muammar Gaddafi’s notorious Abu Salim prison in Tripoli
• Formed his own small militia during the anti-Gaddafi uprising
• Denies any links to al-Qaeda but has expressed admiration for it
• Also denies any role in the attack on the US embassy in 2012, but eyewitnesses report him being there
• US state department says he is a senior leader in Islamist group Ansar al-Sharia
According to prosecutors, the first wave of attackers assembled outside the gates of the mission about 21:45 local time on 11 September 2012.
They were armed with AK-47-type rifles, handguns and rocket-propelled grenade launchers.
Stevens and diplomat Sean Smith died in the fire, while the remaining state department workers escaped to a separate US facility nearby.
That building soon came under attack, and security officers Tyrone Woods and Glen Doherty were killed by mortar fire.
Prosecutors said Mr Abu Khattala entered the destroyed US mission and “supervised the exploitation of material from the scene” by armed men.
According to US prosecutors, in the days following the attack, Mr Abu Khattala “attempted to obtain various types of equipment, including weapons, to defend himself from feared American retaliation for the attack”.
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