Another 143 Turkish soldiers were wounded in the operation dubbed "Olive Branch" which began on January 20 against the Syrian Kurdish People's Protection Units (YPG) militia in the western region of Afrin, a statement said.
The PKK, proscribed as a terrorist organisation by Ankara and its Western allies, has waged a three-decade insurgency against the Turkish state.
Some 1,369 "terrorists" had been neutralised during the operation, the army said, referring to those killed but also those captured or wounded.
It was not immediately possible to verify this figure.
The Observatory said at least 74 civilians have been killed in the operation so far.
Turkey has repeatedly insisted it is taking all the necessary precautions to avoid harming civilians and says there have been no civilian casualties to date.
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