The 2018 Hong Kong Legislative Council by-election was held on 11 March 2018 for four of the six vacancies in the Legislative Council of Hong Kong (LegCo) - the Hong Kong Island, Kowloon West and New Territories East geographical constituencies and the Architectural, Surveying, Planning and Landscape functional constituency - resulting from the disqualification of six pro-democrat and localist camp Legislative Council members over the 2016 oath-taking controversy. The by-election for the two other seats was not held due to pending legal appeals by the two disqualified legislators.
The pro-democrats and pro-Beijing camp each won two seats in the election. Independent democrat Au Nok-hin replaced Demosistō's Agnes Chow - whose candidacy was rejected before the election - won in Hong Kong Island, and the Neo Democrats' Gary Fan retook his seat in New Territories East, while pro-Beijing nonpartisan Tony Tse, who was defeated in his 2016 re-election bid, regained the Architectural, Surveying, Planning and Landscape seat, and Vincent Cheng of the Democratic Alliance for the Betterment and Progress of Hong Kong (DAB) caused an upset in Kowloon West by narrowly defeating independent democrat Yiu Chung-yim who lost his seat in the oath-taking controversy, making it the first time the pro-Beijing camp received a greater vote share than the pro-democrats in a geographical constituency since 2000 and the first time a pro-Beijing candidate won in a geographical constituency by-election since 1992.
The vote share of the pro-democracy camp dropped significantly from the traditional level of around 55 per cent to only 47 per cent, with a low turnout of 43 per cent. As a result, the pro-Beijing camp maintained its dominance in the geographical constituencies following the oath-taking disqualification with a one-seat majority.
Background
The 2016 Legislative Council election saw the emergence of the newly founded localist camp legislators elected to the Legislative Council, including Sixtus Leung and Yau Wai-ching of the pro-independence Youngspiration, as well as Nathan Law of the Demosistō and nonpartisans Lau Siu-lai and Eddie Chu who ran under the banner of the "democratic self-determination".
On 12 October 2016 the inaugural meeting of LegCo, Sixtus Leung and Yau Wai-ching used the oath-taking ceremony as a platform to protest, by claiming that "as a member of the Legislative Council, I shall pay earnest efforts in keeping guard over the interests of the Hong Kong nation," displaying a "Hong Kong is not China" banner, and mispronouncing "People’s Republic of China" as "people’s re-fucking of Chee-na". Their oath were invalidated by the clerk and the controversy caused a huge backlash among the Hong Kong public. Chief Executive Leung Chun-ying and Secretary for Justice Rimsky Yuen took the unprecedented step of launching a judicial review seeking the disqualification of the duo.
On 7 November, the National People's Congress Standing Committee (NPCSC) controversially interpreted Article 104 of the Basic Law of Hong Kong to "clarify" the requirements that the legislators need to swear allegiance to Hong Kong as part of China when they take office, stating that "who intentionally reads out words which do not accord with the wording of the oath prescribed by law, or takes the oath in a manner which is not sincere or not solemn" should be barred from taking their public office and cannot retake the oath. As a consequence, the High Court disqualified Sixtus Leung and Yau Wai-ching on 15 November. On 25 August 2017, the Court of Final Appeal rejected a final bid by Sixtus Leung and Yau Wai-ching.
On 2 December, Leung Chun-ying and Rimsky Yuen lodged another judicial review against Nathan Law, Lau Siu-lai, Leung Kwok-hung and Yiu Chung-yim who also added words into or changed their tones when reading the oaths during the ceremony. As a result, the High Court ruled the four pro-democracy legislators were to lose their seats on 14 July 2017.
The government announced the date of the by-election for four of the six constituencies would be on 11 March 2018. Nevertheless, the by-elections of the other seat in Kowloon West and New Territories East after the disqualification of Lau Siu-lai and Leung Kwok-hung would not be held as the duo are seeking for appeal. Lau and Leung were seeking for appeals strategically to avoid the by-election of both two seats in Kowloon West and New Territories East to be held together, which would give pro-Beijing camp the advantage to take at least one seat away from the pro-democrats in each constituency.