Tsin Sai-nin (Chinese: 錢世年) was a Hong Kong educator, unionist and politician.
Tsin ran for the 1973 Urban Council election but did not receive support from the Teachers' Association.
Tsin also took the leading role in transforming the office was later into the Hong Kong Professional Teachers' Union (HKPTU) in 1973, the most powerful teachers' union in Hong Kong, but resigned from the chairmanship of the preparatory committee in 1973 after being elected to the Urban Council and was replaced by Szeto Wah.
[1] In 1978, he petitioned to Minister of State for Foreign and Commonwealth Affairs Lord Goronwy Robert and British Members of Parliament Frank Hooley on the constitutional reform in Hong Kong with other Urban Councillors Elsie Elliott and Denny Huang, but their request for reform was not met.
[3] In 1981, Tsin founded the Association for Democracy of Hong Kong in response to the government's district administration reform under the Green Paper proposal published in June 1980.