Turkey's legal system follows a civil law tradition, with some Islamic law influence.

The constitution allocates power among three branches of government: the executive, led by the President; the legislative, in the form of a unicameral parliament knowns as the Turkish Grand National Assembly (Türkiye Büyük Millet Meclisi), and an independent judiciary with the Constitutional Court ((Anayasa Mahkemesi) at its pinnacle.

The Turkish constitution establishes the hierarchy of sources of law as follows: 

• The Constitution

• Codes (comprehensive legislative works like the civil code and penal codes) and statutes(individual laws enacted by the Assembly)

• International treaties (once ratified by parliament)

• Presidential decrees (issued by the President to regulate matters within executive authority)

• By-laws (administrative rules and procedures issued by the President, ministries and public corporate bodies)

Doctrine (secondary sources) is also playing an increasing role in guiding the decisions of judges, administrators and legislators.

For more information about the Turkish legal system and sources of law, see Foreign Law Guide (Brill Online) ; Legal Systems in Turkey: Overview (Westlaw -  select Practical Law and run search); and Introduction to Turkish Law (2020)