The principle of natural judge covers a wide area in our law. Its evolution from past to present makes it necessary to question the place of this principle in our legal order. As a general principle of law, the principle of natural judge gives rise to many controversial issues. The main discussions of this study are the institution of transfer of legal action in the criminal procedure, the Supreme Court trials, the unnecessary hesitation of the judge, the appointment of a legal expert, the connection between the courts, the way this principle is regulated in comparative law, the difference between the legal judge guarantee and the natural judge, and the geographical guarantee in terms of the principle of natural judge. The necessity of the geographical assurance, which was brought to the agenda again with the Judicial Reform Strategy Document, in terms of the natural judge principle was grounded deontologically at the end of the study.