Madrid agreement concerning the international registration of marks, signed at 189 1. It is an international treaty that regulates and standardizes international trademark registration. At present, the Madrid system has more than 100 member countries and organizations.

The international registration of trademarks in Madrid refers to the trademark registration among the member countries of Madrid Union according to the provisions of madrid agreement concerning the international registration of marks (hereinafter referred to as Madrid Agreement) or Madrid Protocol on International Registration of Trademarks (hereinafter referred to as Madrid Protocol). International registration of trademarks usually refers to the international registration of trademarks in Madrid. "Madrid Union" refers to the special union for international registration of trademarks composed of countries or intergovernmental organizations that apply the Madrid Agreement and the Madrid Protocol.