For name-surname.com.tr applications, a copy of identification certificate is required.

For the applications made by the legal entities and organisations; the official documents required must certify that the domain name you apply for is your registered trademark or corporate name. One official document that appropriate for the application, which may be "Commercial Registration Certificate", "Trademark Registration Certificate" etc., is sufficient to register a ".tr" domain.

Furthermore, foreign applicants are to prove business activity in Turkey or have a business relation with a company that is domiciled in Turkey and provide supporting official documents such as franchising agreement, distribution agreement, invoice, custom papers etc.

For any other situation apart from foregoing, you are required to perform your online application and then submit your document(s). You will be informed immediately after your application and document(s) are evaluated.

In order to register ".org.tr" sub-domain name, bylaws of the applicant organisation or
At least three supporting letters from three different NGOs must be submitted to ".tr " Domain Names Administration.
"av.tr" is a sub-domain name for Turkish which has been opened for the use of freelance lawyers/solicitors, law offices and lawyer partnerships that are registered to "Turkish Bar Association".
".k12.tr" is a sub-domain name for Turkish primary and secondary schools that are approved by the Ministry of National Education.
".edu.tr" is a sub-domain name for Turkish higher education institutes that are recognized by "Higher Education Council (YOK)"
"net.tr" is a sub-domain for the use of Turkish institutions and organisations that offer various internet supply services.
"bel.tr" is a sub-domain name for Turkish city and town municipality organisations.
".dr.tr" is a sub-domain name for doctors of medical science, doctor partnerships, hospitals and the first level health organisations that are registered to "Turkish Medical Association".
"gov.tr" is a sub-domain name for Turkish governmental organisations and institutionals.
".pol.tr" is a sub-domain name for the Turkish Police organisation.
No document requested at any stage of the registration for ".biz.tr" and ".info.tr" sub-domain names.
No document requested at any stage of the registration for ".name.tr" sub-domain names. However, if any case of a conflict, inconsistency, malicious act or an evidence of domain name trade activities is determined, the domain name owner may be requested to present supportive documents; moreover, the registration may be discontinued without prior notice or warning.
No document requested at any stage of the registration for ".gen.tr" sub-domain names.
No document requested at any stage of the registration for ".web.tr" sub-domain names.
No document requested at any stage of the registration for ".tv.tr" sub-domain names.
No document requested at any stage of the registration for ".tel.tr" sub-domainnames. However, if any case of a conflict, inconsistency,malicious act or an evidence of domain name trade activities is determined, the domain name owner may be requested to present supportive documents; moreover, the registration may be discontinued without prior notice or warning.
No document requested at any stage of the registration for ".name.tr" sub-domain names. However, if any case of a conflict, inconsistency, malicious act or an evidence of domain name trade activities is determined, the domain name owner may be requested to present supportive documents; moreover, the registration may be discontinued without prior notice or warning.

Important Notes;

A) .TR DOMAINS CAN NOT SUPPORT THE WHOIS PROTECTION
B) .TR PROHIBITED USE OF THE "REGISTERED (AD-SOURCE OR COMPANY)" INFORMATION ON EXTENDED DOMAINS IS NOT USED FOR COMMERCIAL PURPOSES. 
C) .COM.TR YOU WANT TO TRANSFER YOUR EXTENDED DOMAIN TO ANOTHER IF YOU REQUIRE A PERSONAL CIRCUMSTANCE WHICH YOU WANT TO TRANSFER IN YOUR FIRM OR TRADE REGISTRATION