Alvin Cheng
| y = Jehng Gám Múhn
| p= Zhèng Jǐnmǎn
}}
Alvin Cheng Kam-mun (, born 23 June 1988), also known as "Brother Four Eyes" (), is a Hong Kong political activist, a member of Civic Passion, and founder of student activist organization Student Front. In 2014, he led a rally in support of the Hong Kong Umbrella Movement during the G20 Brisbane summit.
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