The five, including from Hamas-linked media, had been arrested in the occupied West Bank on accusations of "leaking sensitive information to enemy groups".
Three of the five were freed earlier today, with the others expected to be released later in the day, the lawyer said.
"The relevant courts decided to free five journalists and all journalists are supposed to be released," Alaa Freijat, lawyer for the Palestinian Journalists Syndicate, told AFP.
They were held under the PA's new electronic crimes law, which has been criticised by rights groups who say it restricts criticism of officials on social and traditional media, with the potential for jail sentences.
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The releases came a day after Hamas freed a journalist in the Gaza Strip from the PA-linked Palestine TV.
Fouad Jarada, 35, was arrested in June by Hamas authorities.
The PA run by president Mahmud Abbas is based in the West Bank, while Islamist movement Hamas controls Gaza.
The two factions have been unable to reconcile in a decade and are often at loggerheads.
The journalists' syndicate has called for media to be spared the fallout from the split between the Palestinian factions.
In 2016, Freedom House classified the media environment in the West Bank and Gaza as "not free", ranking it below Iraq and Zimbabwe and level with Russia.
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