The latest move represents a major escalation against the Muslim Brotherhood of deposed Egyptian president Mohamed Morsi and indicates rising concern in Riyadh over the possible return of battle-hardened Saudis extremists from Syria.
In addition to the Muslim Brotherhood, Saudi listed Al-Nusra Front, which is Al-Qaeda's official Syrian affiliate, and the Islamic State of Iraq and the Levant (ISIL), a rogue group fighting in both Syria and Iraq, as terrorist organisations.
Saudi and other conservative Gulf monarchies have long been hostile towards the Muslim Brotherhood, fearing that its brand of grass-roots activism and political Islam could undermine their authority.
Riyadh is a staunch supporter of the Sunni-led rebels battling to overthrow Syrian President Bashar al-Assad but has long feared blowback from radical jihadist groups, particularly after a spate of attacks by a local Al-Qaeda franchise from 2003 to 2006.
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King Abdullah last month decreed jail terms of up to 20 years for belonging to "terrorist groups" and fighting abroad.
Supporting such groups, adopting their ideology or promoting them "through speech or writing" would also incur prison terms, the decree added.