The Saudi Press Agency said nine accused were jailed for between five and 33 years for activities including "photographing locations and collecting information, in the Al-Qaeda terrorist operation that targeted three different locations in Khobar," a community on the Gulf coast.
In May 2004 a series of attacks and a hostage taking in Khobar killed 22 people and wounded 25, many of them foreigners.
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The man sentenced to death was found guilty of numerous offences including transporting suspects and their weapons "so that they could execute the operation to storm the three locations and carry out the terrorist operation," SPA said.
Authorities in 2011 established specialised tribunals to try Saudis and foreigners accused of belonging to Al-Qaeda or of involvement in deadly attacks in the kingdom from 2003 to 2006.
The latest convictions come with Saudi Arabia and its Gulf neighbours participating in US-led air strikes against Islamic State group extremists in Syria, raising concerns about possible retaliation in the kingdom.