Sun Yee On| Founded | 1919 (1919) |
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| Founding location | British Hong Kong |
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| Years active | 1919–present |
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| Territory | Chaozhou, Mainland China, Hong Kong, Mainland China, Japan, France, South Africa, United Kingdom, India, Thailand, Korea, Colombia, Canada, United States, Australia, Central America |
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| Ethnicity | Chinese |
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| Membership | 25,000 |
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| Activities | racketeering, counterfeiting, extortion, drug trafficking, money laundering, murder, illegal gambling |
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| Allies | Wo Hop To, Wo On Lok, Albanian mafia, Camorra, Serbian mafia, American Mafia, Sinaloa Cartel |
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| Rivals | 14K, Wah Ching, Wo Shing Wo |
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Sun Yee On (Chinese: 新義安; Jyutping: san1 ji6 on1; Cantonese Yale: sān yih ōn) is one of the leading triads in Hong Kong and China. It has more than 25,000 members worldwide.
It is also believed to be active in the UK, the United States, France, and Belgium.