Caspar Tsui Ying-wai (Chinese: 徐英偉; born 2 September 1977) is a Hong Kong politician, government official and DAB party member.

It was reported that on one occasion that year Tsui appeared unable to specify the Hong Kong minimum wage when a journalist asked him, and he had to pass the question to the Secretary, Law Chi-kwong.

[4] An unnamed "government insider" spoken to by the South China Morning Post described Tsui as a "diligent" contributor to Carrie Lam's "ambitious" governmental reforms, notably regarding sports-related and cultural policies.

[5] In 2020, Tsui was criticised by, among others, LegCo member Alice Mak for posting an article on the Internet of himself eating sweet soup during a fatal fire in Yau Ma Tei, and responding to critics that there was "no conflict in multitasking".

"[7] In April 2021, Tsui briefed the sports and culture industries on why the NPCSC implemented rules to only allow "patriots" to serve in the government, and asked for their full support.

)[11] The South China Morning Post reported that many such premature resignations were encouraged by rumours spread in the media by "unspecified government sources" that disqualified councillors would have to return their entire salaries and operating expense payments since taking office.

[16] On 25 January 2022, South China Morning Post reported that Chief Executive Carrie Lam wanted to fire Tsui from his post over the party scandal, but Lam encountered resistance from pro-establishment figures, including Tsui's party, the Democratic Alliance for the Betterment and Progress of Hong Kong (DAB).