Sa’d al-Din Köpek (Arabic: سعد الدين كوبك بن محمد, Sa’d al-Dīn Kobek bin Muhammad; Turkish: Sadettin Köpek, died 1238[1]) was a court administrator under two 13th century Seljuq Sultans of Rum and is known for his indirect role in the subjugation of the Sultanate of Rum by the Mongol Empire due to his disloyalty and aim for greater power during the turbulent 13th century in Anatolia.

He served as Master of the Hunt and Minister of Works under Kayqubad I and, after in the latter capacity, supervised the construction of Kubadabad Palace on the shore of Lake Beyşehir.

He had Kaykhusraw's two half-brothers strangled along with their mother, an Ayyubid princess, but he did not become successful, was later killed by Husam al-Din Qaraja,[3] and was hanged on the Seljuk palace walls for treason.

He suspected the loyalty of the Khwarezmians, the remnant followers of Jalal al-Din Manguberti whom Kayqubad had installed in various Anatolian fortresses, and had their leader, a certain Kirkhan, imprisoned.

[5] Known as Zazadin Han, the caravanserai bears two inscriptions: one naming Köpek as founder and dated 1235–36, the other indicating the patronage of both Kayqubad I and Kaykhusraw II.