Turkish Abstract: Veri sorumlusu kavrami, bizim icin artik oldukca bilindik. Zira veri sorumlusu, Kisisel Verilerin Korunmasi Kanunu’nun (KVKK) ve Kisisel Verilerin Korunmasi Hukukunun adeta kalbinde yer aliyor . Bu hakkin saglanmasi ve korunmasi icin merkezi bir role sahip. Ancak o kadar da asina olmadigimiz bir kavram daha var: Ortak veri sorumlusu (joint controllers). 29 Temmuz 2019 tarihinde Avrupa Birligi Adalet Divani (ABAD), bir suredir beklenen Fashion Id ve Facebook Irlanda hakkindaki kararini acikladi ve bize bu konuyu tartisma ortami sagladi. Ortak veri sorumlusu kavramini bir ornekle somutlastiralim. Sozgelimi, turistik turlar duzenleyen acenteler, tura katilacak kisilerin verilerini havayolu sirketleri ve otellerle paylasabilir, bu veriler uzerinde birlikte islem gerceklestirebilirler. Ancak bu durum, havayolu sirketinin, otel ve tur acentesinin ortak veri sorumlusu oldugunu gostermez. Burada kisilerin hepsi kendi farkli amaclari dogrultusunda ve farkli araclarla veri isleme faaliyeti gerceklestirir, hepsinin farkli bir veri kayit sistemi bulunur. Elbette bunun aksinin bulundugu durumlara da rastlanilir. Bu durumlari asagida inceleyecegim kararlar bazinda ortaya koyacagim. English Abstract: The concept of data controller is now well known to us. Because the data controller is at the heart of the Personal Data Protection Law (KVKK) and the Personal Data Protection Law. It has a central role in ensuring and protecting this right. However, there is another concept that we are not so familiar with: joint controllers. On 29 July 2019, the European Court of Justice (ABAD) announced its long-awaited decision on Fashion Id and Facebook Ireland, and gave us a forum for discussion. Let's concretize the concept of common data controller with an example. For example, agencies that organize touristic tours can share the data of the people participating in the tour with airlines and hotels, and can perform joint operations on this data. However, this does not indicate that the airline company is the common data controller of the hotel and tour agency. Here, all individuals perform data processing activities for their own different purposes and with different tools, all of them have a different data recording system. Of course, there are situations where the opposite is found. I will reveal these situations on the basis of the decisions I will examine below.