After the acceptance of Criminal Procedure Code no.5271, istinaf (appeal) has become a part of Turkish judicial system. However, only when pursuant to Ministry of Justice’s 7.11.2015 dated Official Gazette decision, Regional Istinaf (appeal) Courts have been established in Istanbul, Izmir, Antalya, Samsun, Erzurum and Gaziantep; thereby with the establishments of the courts istinaf (appeal) legal remedy came into force. This work consists of explanations regarding istinaf (appeal) legal remedy, decisions that are allowed and not allowed to be part of istinaf (appeal), istinaf (appeal) request and its timing, istinaf (appeal) instances without a request (automatic), persons who can apply for istinaf (appeal), the duties resting on the first degree trial court that has given the initial judgment and the regional istinaf (appeal) court following istinaf (appeal) application, and finally evaluations were made with regards to the legal remedy in question.