Abdulaziz al-Hussain is a Saudi Arabian human rights activist, lawyer, and founder of ALQST (Association for Human Rights and Civic Engagement), established in 2016 to support political prisoners and advocate for judicial reforms in Saudi Arabia. He has been detained since March 31, 2018, when he was arrested at King Khalid International Airport in Riyadh upon returning from a human rights conference in Geneva, Switzerland. Al-Hussain has been held without charge or trial in Al-Ha'ir Prison, south of Riyadh, where he reportedly endured solitary confinement and health deterioration due to inadequate medical care. His advocacy focused on criticizing Crown Prince Mohammed bin Salman's policies, including the 2017-2018 anti-corruption purge, arbitrary arrests, torture allegations, lack of fair trials, and the suppression of dissent. He was particularly vocal about high-profile cases of detainees, such as women's rights activists and intellectuals, and called for the release of prisoners of conscience. International organizations like Amnesty International and Human Rights Watch have campaigned for his release, designating him a prisoner of conscience. His case underscores the risks faced by Saudi dissidents, with allegations of enforced disappearance and family harassment. Al-Hussain's activism through ALQST continues to influence global awareness of Saudi human rights issues. He is married with children, though details about his personal life remain limited due to the sensitivity of his situation.