Fazul Abdullah Mohammed (born either August 25, 1972, December 25, 1974, or February 25, 1974) is a suspected member of the Al Qaeda terrorist organization, believed to have been a conspirator in the 1998 U.S. embassy bombings, an association for which he is listed as one of the FBI Most Wanted Terrorists. He once moved into the house of Wadih el Hage, where he served as a secretary.

He has several aliases, including Abdallah Fazul, Abdalla Fazul, Abdallah Mohammed Fazul, Fazul Abdilahi Mohammed, Fazul Adballah, Fazul Abdalla, Fazul Mohammed, Haroon, Harun, Haroon Fazul, Harun Fazul, Fadil Abdallah Muhamad, Fadhil Haroun, Abu Seif Al Sudani, Abu Aisha, Abu Luqman, Fadel Abdallah Mohammed Ali, and Fouad Mohammed.

He was born in Moroni, Comoros Islands. He has citizenship from both the Comoros and Kenya. He speaks French, Swahili, Arabic, English, and Comorian.

On May 26, 2004, he was listed along with six others when United States Attorney General John Ashcroft announced that reports indicated that Al Qaeda members were planning a terrorist action for the summer or fall of 2004. Others listed on that date were Ahmed Khalfan Ghailani, Amer El-Maati, Aafia Siddiqui, Adam Yahiye Gadahn, Abderraouf Jdey, and Adnan G. El Shukrijumah.