Police arrested Serpil Kemalbay of the Peoples Democratic Party (HDP) in Ankara on February 13, two days after she handed over her job to a successor.
"Our former co-leader Serpil Kemalbay has been released. Defending peace is not a crime; it is an obligation, an honour!" the party said on Twitter.
Kemalbay, who still faces charges and has been placed under judicial control, will have to report regularly to the authorities and cannot leave the country, an HDP official told AFP on condition of anonymity.
At a party congress on February 11 Pervin Buldan took over Kemalbays job.
Turkish media reported that Kemalbay had been taken into custody over calls for protests against the cross-border operation dubbed "Olive Branch" launched last month.
Turkey is conducting an air and ground offensive against the Peoples Protection Units (YPG) militia in the Afrin region of northern Syria.
Ankara says the YPG are "terrorists" linked to the outlawed Kurdistan Workers Party (PKK), which has waged an insurgency against the Turkish state since 1984.
Since the offensive began in Syria, Turkish authorities have detained 786 people, including 587 over disseminating "propaganda" against the operation.
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