An Ahdname or ahidnâme is a type of Ottoman charter commonly referred to as a capitulation. During the early modern period, the Ottoman Empire called it an Ahidname-i-Humayun or an imperial pledge and the Ahdname functioned as an official agreement between the Empire and various European states.

The Ahdname still requires much detailed study regarding its historical background and about what type of document it was. What is known however is that the Ahdname was an important part of Ottoman diplomacy in that it set forth a contractual agreement between two states, usually between the Ottoman Empire and European nations, like Venice. It was influential in the way it helped to structure society and maintained the agreements made between nation states.

In Venice, Adhnames were also used to maintain political and commercial links with the Ottoman Empire. This agreement between Venice and the Ottoman Empire ensured that Italian merchants were protected during their commerce trips into the Empire. These Ahdnames also provided a certain level of physical protection as they helped provide Italian merchants with hospice. After all, Venice was very aware that in order to protect the strength of their commerce, it was imperative to remain to in good standing with the Ottoman Empire.