Yeung Sum (Chinese: 楊森; born 22 November 1947 in Guangzhou) is a Hong Kong politician and academic.

He was a committee member of the Hong Kong Alliance in Support of Patriotic Democratic Movements in China during the Tiananmen protests of 1989 and remained critical of the Chinese government after the bloody crackdown.

On 28 February 2020, Yeung was arrested over his involvement in a march on 31 August 2019 which was part of protests sparked by the extradition bill, and had been classified by police as illegal assembly.

[2][3] On 18 April, Yeung was again arrested as one of 15 Hong Kong high-profile democracy figures, on suspicion of organizing, publicizing or taking part in several unauthorized assemblies between August and October 2019 in the course of the anti-extradition bill protests.

[4][5] On 10 June 2022, Sum, along the two other pro-democracy figures, had his Silver Bauhinia Star honour removed, and his Justice of the Peace appointment was revoked by the government due to his jail sentences related to anti extradition-bill protests.