Public anger over the treatment of Saudi detainees in Guantanamo has been high in the Gulf Arab state, a key US ally.
Two Saudis were among three prisoners who hanged themselves in June at the prison.
Around 50 of the nearly 400 detainees still held at the facility are thought to be Saudi.
Detainees released
US department of defence announced on 14 December that it had transfered 16 detainees from the controversial prison in Cuba to Saudi Arabia.
Saudi Arabia has freed many of the 45 prisoners who were repatriated last year for having ended their jail terms.
Most of the 19 suicide hijackers who carried out the attacks on US cities in 2001 were Saudis.
Washington has designated Guantanamo prisoners "enemy combatants", denying them the prisoner-of-war status that would guarantee then certain rights under international law.