Assyrian Democratic Organization (ADO) (Syriac: ܡܛܟܣܬܐ ܐܬܘܪܝܬܐ ܕܝܡܩܪܛܝܬܐ; Arabic: المنظمة الآثورية الديمقراطية), also known as "Mtakasta/Mtakasto", is an Assyrian political party based in Syria. Founded in 1957, it is the oldest Assyrian political party in Syria, and was established as a national, political and democratic movement with the objectives of safeguarding the existence of the Assyrian people, as well as the realization of their legitimate national aspirations (political, cultural, administrative) in their historic homeland.
The Assyrian Democratic Organization faced many upheavals under the Assad family of Ba'athist Syria, including bans on its activity. The party is currently based in Qamishli as part of the Autonomous Administration of North and East Syria, and has been part of the Syrian National Coalition since October 2011. Currently, the ADO boasts of membership of around 5000, advocates for the formation of civil, secular Syrian state, and enjoys good relations with Western countries such as the United States.