That man was named as Abu Ussaid al-Falluji, a Saudi, who occupied a "top position in their deviant organisation," the interior ministry said in statement carried by the state news agency SPA.
"Through his information role over the Internet … he advanced to become the link between the followers of the deviant group and its sympathisers outside and inside the homeland," it added.
"Deviant group" is the term Saudi authorities used to refer to the Al-Qaeda branch in the kingdom.
A second Saudi suspect was identified as Abu Abdullah al-Najdi, said to be a member of a group attempting to publish a new edition of a jihadist publication named "Sawt al-Jihad" (The Voice of Jihad).
The ministry did not say when and where the two men were arrested.
A third suspect was arrested in the Muslim holy city of Medina while attempting to post another jihadist publication online. The ministry did not identify him, nor disclose the date of his arrest, but said he was a foreigner.
Al-Qaeda had said in a February edition of Sawt al-Jihad that it was planning major operations aimed at driving Western interests out of the Arabian peninsula.
Al-Qaeda has been responsible for a wave of violence that has shaken the country since May 2003.
At least 90 civilians, 55 members of the security services and 136 militants, have been killed since then, according to official figures.
