The human rights organization Amnesty International claims to be closing its offices in Hong Kong.
As the organization announced on Monday, the step was based on the so-called security law passed by Beijing.
The law makes it "practically impossible for human rights organizations in Hong Kong to operate freely and without fear of serious reprisals from the government," said chairman Anjhula Mya Singh Bais.
Amnesty made the decision "with a heavy heart".
The so-called Security Act came into force in July 2020.
It allows the authorities to crack down on any activity that they believe threatens China's national security.
More than 150 people have been arrested under the security law so far, including journalists, students and former MPs.
In Hong Kong there had been mass protests against Beijing's growing influence for months in 2019.
Since then, the authorities have acted with increasing severity against critics in the Special Administrative Region.