The Qatar-based broadcaster said it would appeal the "grotesque" verdict as soon as the Cairo court has explained its decision, and would also "intensify" its campaign to get its reporters freed.
At a press conference at its Doha headquarters, the network's head of litigation Farah Al Muftah said Al-Jazeera would not give up.
"At this point we are just waiting for the actual reasoned decision from the court to be released," she said.
"Once that is released we will have 60 days to appeal at the court of cassation, which we intend to do."
Giles Trendle, acting managing director of Al-Jazeera English, said the company was "in a state of shock" but vowed to "look at relaunching, intensifying and escalating" the international campaign for the journalists' release.
"Today's verdict is yet another deliberate attack on press freedom," he said.
"It's a dark day for the Egyptian judiciary. Rather than defend liberty and the free and fair media, the Egyptian judiciary has compromised its own independence."
Today's decision came despite a worldwide campaign calling for the journalists' acquittal on charges of "spreading false news".
Canadian Mohamed Fahmy and Egyptian producer Baher Mohamed were in court for today's verdict.
Australian journalist Peter Greste was tried in absentia after his deportation early this year.
At least three other co-defendants, accused of working with Al-Jazeera, received similar sentences.
The retrial was ordered after an appeals court overturned an initial sentence of seven years in prison, saying the prosecution had presented scant evidence.
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