Seif Adnan Kanaan (died October 22, 2004), was an Iraqi citizen who was abducted in Iraq and beheaded on October 22, 2004. The reason given by the kidnappers, the Army of Ansar Al-Sunna, was that he was employed by the United States Army.

On October 22, 2004, a video was posted on the website of the Army of Ansar Al-Sunna, apparently showed the beheading of Kanaan.

Kanaan was shown in a picture surrounded by the three hooded gunmen with a banner of the Army of Ansar Al-Sunna in the background. They accused him of being an American spy recruited in Mosul. In the video the man makes a statement:

"My name is Seif Adnan Kanaan. I work at Mosul airport... My second job is to supply beverages to the US army," the victim said, surrounded by three hooded gunmen.

One of the gunmen then reads a statement saying that "the mujahedeen (Islamic fighters) in Mosul were able to capture ... a crusader spy recruited by US forces to spy and inform on the mujahedeen in Mosul."

The gunman said the purported spy worked at a US base in Mosul airport and "was known for his allegiance to the Americans and his hatred for the mujahedeen." He had "publicly insulted (Islam's) Prophet Mohammed."

Adnan (Arabic: عدنان‎) is the traditional ancestor of the Adnanite Arabs of northern, central and western Arabia, as opposed to the Qahtani of southern and south eastern Arabia who descend from Qahtan.

Adnan is the father of the Adnanite Arabs who are the northern Adahoe tribes that occupied Hijaz, Yamama regions as well as most parts of northern Arabia.

According to Islamic tradition, the Islamic prophet Muhammad was descended from Adnan. Tradition records the genealogy from Adnan to Muhammad comprises 21 generations. "The following is the list of chiefs who are said to have ruled the Hejaz and to have been the patrilineal ancestors of Muhammad."