We, the undersigned 74 organizations, call upon the Egyptian authorities to immediately and unconditionally release 29-year-old student and researcher Ahmed Samir Santawy, who has been arbitrarily detained since 1 February 2021 on bogus terrorism-related charges. The undersigned organizations further call on the authorities to ensure prompt, independent, impartial, transparent, and effective investigations into Ahmed Samir Santawy’s allegations of being subjected to enforced disappearance and ill-treatment by security forces following his arrest.