The International Union of Architects (UIA), is a non-governmental organisation, a global federation of national associations of architects, that are its members.

The UIA's goal is to unite the architects of the world without any form of discrimination. From the 27 delegations present at the founding assembly in Lausanne, Switzerland, in 1948, the UIA has grown to encompass the key professional organisations of architects in 124 countries and territories, and now represents, through these organisations, close to one million three hundred thousand architects worldwide.