Chan Kin-man was found guilty last year of conspiracy to commit public nuisance for his role in planning and mobilising supporters during the 79-day protest that brought parts of the Chinese-ruled city to a standstill.
Three protest leaders were given 16 months, one of them suspended for two years, two received eights months in prison and two were given suspended eight-month sentences on charges of public nuisance offenses.
In a summary of his judgement, Justice Johnny Chan noted that while the concept of civil disobedience is "recognised in Hong Kong", it wasn't a defence to a criminal charge.
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