Wong, 21, who had pleaded guilty to the contempt charge, was already on bail pending an appeal over a six- month sentence for another offence related to the Umbrella Movement.
It comes as some fear prison terms for leading campaigners are discouraging young people from expressing their views and muzzling freedom of speech in the semi- autonomous city, where there are growing signs that China is increasing its control.
Ahead of the hearing, Joshua Wong -- who became the teenage face of the Umbrella Movement -- said he had "no regrets" about his involvement.
"They can lock up our bodies but they can't lock up our minds," he told reporters.
Dozens of supporters gathered outside the High Court, chanting: "Civil disobedience, no fear!" and "I'm a Hong Konger, I want universal suffrage!"
The Umbrella Movement was an unprecedented rebuke to Beijing as tens of thousands of protesters brought parts of the city to a standstill demanding fully free leadership elections to replace a system where the chief executive is selected by a pro-Beijing committee.
Beijing has been further incensed by the emergence of some activists calling for independence for Hong Kong since the failure of the Umbrella Movement to win reform.
Wong's party Demosisto wants self-determination for the city.
Hong Kong has been governed under a "one country, two systems" deal since 1997, when Britain handed the territory back to China.
The agreement allows citizens rights unseen on the mainland, including freedom of speech and a partially directly elected parliament, as well as an independent judiciary.
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