Turkey's record on media freedom and on rights for its Kurdish minority have long been obstacles in Ankara's bid to become a member of the European Union.
Judges in Diyarbakir, the largest city in the mostly Kurdish southeast, Wednesday found Ozan Kilinc guilty on charges of disseminating terrorist propaganda on behalf of the PKK, state-run Anatolian news agency reported.
They said Kilinc had allowed the daily to publish photographs and texts praising the PKK during 12 editions in June 2009. It was not immediately possible to contact Kilinc.
Radikal newspaper said Azadiya Welat has had to replace six editors in three years since it started publishing in 2006 because the editors had to either flee the country to avoid imprisonment or were jailed.
The PKK, which launched an armed campaign against the Turkish state for Kurdish self-rule, is branded a terrorist organization by Ankara, the EU and Washington.
The European Court of Human Rights has repeatedly challenged Turkey's harsh anti-terrorism laws. Conservative prosecutors and judges are known to interpret anti-terrorism laws severely.
Prime Minister Tayyip Erdogan's AK Party government has expanded the rights of minority Kurds since it took office in 2002. But efforts to launch a so-called "Kurdish initiative" were dealt a blow after the Constitutional Court last year shut down a Kurdish party for what it said were links to the PKK.