The mandate, first approved by parliament in October 2014, has been renewed every year since then.
It allows military action in Turkey's two southern neighbours against Islamic State (IS) extremists and other groups deemed by Ankara to be terror organisations.
The approved motion said it was "essential for Turkey's national security to take all necessary measures ... in the face of any threats."
Ismet Yilmaz, head of parliament's defence committee, said there would be no let-off in Turkey's fight against terror.
"We will not allow terror groups to shelter or be trained in our country's southern borders, or stage attacks against our country utilising the instable political situation in Iraq and Syria ," Yilmaz was quoted as saying by Anadolu.