Three members of Turkey's security forces and five militants were reported killed in clashes in Hakkari, an area in the restive south-east recently experiencing intense conflict, broadcaster CNN Turk reported.
Nearly 2,000 people have been confirmed killed since a ceasefire collapsed last year, including some 670 members of the security forces and more than 700 militants from the armed Kurdistan Workers' Party (PKK) and its allies.
Each party to the conflict claims to have inflicted a much higher toll on the other side.
The PKK has also stepped up attacks on the ruling Justice and Development Party (AKP) of President Recep Tayyip Erdogan.
The group this week claimed the assassination of AKP member Ahmet Budak in the south-east, saying it was a warning to Kurds in the ruling party which it blames for "massacres" in the mostly-Kurdish south-east of Turkey and racism against the minority group.
The group also claimed an attack this week on the Islamic-rooted AKP's headquarters in Van province which left dozens injured.
Turkey and the PKK have been locked in conflict for more than 30 years, leaving tens of thousands dead. The PKK, which the government deems a terrorist group, is demanding greater autonomy and rights for the Kurds in the country.