The Zhou Yongjun incident was a political controversy which involved the rendition of Zhou Yongjun (周勇军), a former student activist during the Tiananmen Square protests of 1989, by the Hong Kong authorities to the People's Republic of China. Zhou attempted to enter Hong Kong from the United States via Macau using a forged Malaysian passport. Zhou's supporters alleged the renditioning to be illegal, and his lawyer, Democratic Party chairman Albert Ho, described Zhou's case as "posing the biggest challenge to the one country, two systems principle laid down in the Basic Law." The Government of Hong Kong refused to comment on individual cases, and the People's Republic of China said Zhou was detained on several charges, including one of financial fraud.
Zhou was a student at the China University of Political Science and Law at the time of the student protests and ensuing military crackdown on 4 June 1989. He was among a group of students who were photographed kneeling in front of the Great Hall of the People on 22 April that year to present a list of demands to China’s leaders after the death of Hu Yaobang.
Zhou was arrested and held for two years in prison for his role in the protests. He subsequently lost his enrolment status as a student as well as his family registration as a Beijing resident. In 1992, Zhou fled to Hong Kong and then travelled to the United States, where he was granted resident's status. His first attempt to re-enter China was in 1998, but he was caught and sentenced to three years of administrative detention in a re-education-through-labour camp. After his release, he again left in 2002 for the United States,
Zhou made a second attempt to reenter mainland China on 28 September 2008, but he was intercepted by immigration department officials at the Hong Kong Macau Ferry Terminal, on suspicion of entering Hong Kong using a counterfeited travel document. He had travelled from the United States to Macao, using a Malaysian passport purchased from a travel agent in Los Angeles. The passport was in the name of Wang Xingxiang, a known alias of Zhong Gong leader Zhang Hongbao. He had repeatedly been denied requests for an official permit to return to China by the Chinese authorities. Zhou was on his way to Sichuan to visit his ailing father. Zhou was documented in Sichuan saying he was detained on arrival in Hong Kong and then secretly handed over to Shenzhen authorities two days later. Lawyer Li Jinjin said Zhou was initially held at the No.1 Detention Center in the southern city of Shenzhen, and later transferred to the Shenzhen Yantian Detention Center. In May 2009, seven months after his arrest, Zhou's family was notified that he had been detained by Sichuan authorities on fraud charges. The indictment by prosecutors in Shehong county stated Zhou used the alias of Wang Xingxiang, and attempted to transfer money from an account at Hang Seng Bank in Hong Kong to two banks, in the city and in Australia.