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The US-led International Security Assistance Force (ISAF) said Abu Hafs al-Najdi, also known as Abdul Ghani, was killed in an air strike in Kunar province, eastern Afghanistan, on April 13.
ISAF said he was responsible for coordinating "numerous high-profile attacks" and that they had been hunting him for four years.
But spokesman Major Michael Johnson told AFP he could not give details on the attacks for "safety and security reasons" and could not say who was number one on the most wanted list because of legal issues.
The Saudi interior ministry website lists a man named Saleh Nayef Eid al-Makhlafi, with the nicknames Abu Hafs, Abu Hafs al-Najdi and Abdul Ghani, as one of its 85 most-wanted.