A series of sit-in street protests, often called the Umbrella Revolution and sometimes used interchangeably with Umbrella Movement, or Occupy Movement, occurred in Hong Kong from 26 September to 15 December 2014.The protests began after the Standing Committee of the National People's Congress (NPCSC) issued a decision regarding proposed reforms to the Hong Kong electoral system. The decision was widely seen to be highly restrictive, and tantamount to the Chinese Communist Party (CCP)'s pre-screening of the candidates for the Chief Executive of Hong Kong.Students led a strike against the NPCSC's decision beginning on 22 September 2014, and the Hong Kong Federation of Students and Scholarism started protesting outside the government headquarters on 26 September 2014. On 28 September, events developed rapidly. The Occupy Central with Love and Peace movement announced the beginning of their civil disobedience campaign. Students and other members of the public demonstrated outside government headquarters, and some began to occupy several major city intersections. Protesters blocked both east–west arterial routes in northern Hong Kong Island near Admiralty. Police tactics – including the use of tear gas – and triad attacks on protesters led more citizens to join the protests and to occupy Causeway Bay and Mong Kok. The number of protesters peaked at more than 100,000 at any given time, overwhelming the police thus causing containment errors.Government officials in Hong Kong and in Beijing denounced the occupation as "illegal" and a "violation of the rule of law", and Chinese state media and officials claimed repeatedly that the West had played an "instigating" role in the protests, and warned of "deaths and injuries and other grave consequences." The protests precipitated a rift in Hong Kong society, and galvanised youth – a previously apolitical section of society – into political activism or heightened awareness of their civil rights and responsibilities. Not only were there fist fights at occupation sites and flame wars on social media, family members found themselves on different sides of the conflict.Key areas in Admiralty, Causeway Bay and Mong Kok were occupied and remained closed to traffic for 77 days. Despite numerous incidents of intimidation and violence by triads and thugs, particularly in Mong Kok, and several attempts at clearance by the police, suffragists held their ground for over two months. After the Mong Kok occupation site was cleared with some scuffles on 25 November, Admiralty and Causeway Bay were cleared with no opposition on 11 and 14 December, respectively.

The Hong Kong government's use of the police and courts to resolve political issues led to accusations that these institutions had been turned into political tools, thereby compromising the police and judicial system in the territory and eroding the rule of law in favour of "rule by law". At times violent police action during the occupation was widely perceived to have damaged the reputation of what was once recognised as one of the most efficient, honest and impartial police forces in the Asia Pacific region. The protests ended without any political concessions from the government, but instead triggered rhetoric from Chief Executive of Hong Kong CY Leung and mainland officials about rule of law and patriotism, and an assault on academic freedoms and civil liberties of activists.