Reisülküttap (Ottoman Turkish:رأيس الكتاب) (Reis'ül Küttab) was a bureaucratic post in the Ottoman Empire.
Katip (singular of Küttap) means clerk and reis means chief. So Reisülküttap was the chief of clerks in the Ottoman divan (government). There were three (later four) offices under his supervision.[1] During the Growth of the Ottoman Empire, in the 15th and 16th centuries, the reisülküttap was the subordinate of nisanci a post which was a member of the divan. Although reisülküttap was also present in divan meetings, he took no part in the discussions. His superior nişancı was also responsible in foreign relations. So reisülküttap was, in modern terminology, an assistant foreign minister. However, during the stagnation of the empire in the 17th century increasing foreign relations necessitated an independent post for foreign services and the reisülküttap became de facto foreign minister.[2] In 1836, the title of reisülküttap was changed to foreign minister.
In parallel with the increasing importance of reisülküttap some reisülküttaps were later promoted to be grand viziers.