26 April – A 23-year-old Hong Kong woman studying in Japan is arrested by Hong Kong police upon returning to the city for allegedly “inciting secession” due to her online posts supporting pro-democracy protests while abroad; she is released on bail, but her passport is confiscated during investigation.[5]
3 July : The police reward 1 million Hong Kong Dollars for arrest of 8 people who violate the Hong Kong National Security Law, accusing them of endangering national security and colluding with foreign forces.[7][8]
7-8 September: After Typhon Haikui makes landfallHong Kong, flooding reaches record levels, the heaviest since meteorological records began when measured by one hour rainfall. (Recorded 158mm rainfall on Hong Kong Observatory headquarter between 7 September 23:00 and 8 September 00:00).[14]
13 September: Hong Kong authorities prosecute Kurt Leung Kui-ming for importing 18 “seditious” pro-democracy books from the United Kingdom, invoking the offense of “importing seditious publications” for the first time under the National Security Law.[16]
13 October : The Government published gazette notice to announce 1 April 2024 as the day to implement municipal solid waste (MSW) charging.[17]
18 October : Hong Kong Legislative Council passed a bill banning restaurants from providing single-use plastic tableware, tentative effective on 22 April 2024.[18]
18 December: Jimmy Lai, the 76-year-old founder of the pro-democracy newspaper Apple Daily, begins his Hong Kong national security trial. He faces three charges of “foreign collusion” and one sedition charge under the National Security Law, which carries a potential sentence of life imprisonment.[21]
28 December: SMS Sender Registration Scheme will start implement. Under the SMS Registration scheme, SMS sender who have officially registered will have a prefix "#" in the sender IDs, while non-register sender ID will not have prefix "#".[22][23]