Frederike Geerdink, who is based in the Kurdish-majority southeastern city of Diyarbakir, had been briefly detained in January after authorities raided her home, prompting concerns in Turkey and abroad.
She was charged with disseminating "propaganda for a terrorist organisation" in a series of postings on social media and faced up to five years in prison if convicted.
A Diyarbakir court acquitted Geerdink of the charges at the second hearing of the trial today. The ruling came after prosecutors demanded in a surprise move last week that the charges against her be dropped.
Geerdink, who moved to Turkey in 2006, has been based in Diyarbakir since 2012 and specialises in writing about the Kurds.
The case also came as the government and Kurdish leaders are seeking to end the decades-long insurgency in the southeast by the PKK for self-rule and greater rights for Kurds that has claimed tens of thousands of lives.