The Milan Triennial Exhibition of Decorative Arts and Modern Architecture (commonly known as the Triennale di Milano) is a recurring International Exhibition held in Milan dedicated to architecture, design and craftmanship.

 Article 4 of the 1928 Paris Convention states that the Bureau International des Expositions (BIE) may grant recognition to:

 
 “the Milan Triennial Exhibition of Decorative Arts and Modern Architecture, on grounds of historical precedence, provided that it retains its original features”

Created in 1933, following on from the Monza Biennale of decorative arts, the Triennale di Milano aims to foster a unitary vision of all forms of art and creative expression, strictly linked to social evolution and economic development, as well as to stimulate the relationship between industry, art and society at large.

Each edition of the Triennale di Milano is organised around a theme that reflects modern-day issues and promotes experimentation and debate in a contemporary and interdisciplinary perspective, linking art, behavioural sciences and scientific research.

The Triennale di Milano is organised by the Triennale Milano institution that bears the same name, lasts up to six months and is historically based in the Palazzo dell’Arte. Participants include countries, cities, regions, universities, companies, design centres, art associations, museums, non-profit entities as well as young groups of designers.

The most recent edition of the Triannel di Milano took place between 15 July and 11 December under the theme "Unknown Unknowns. An Introduction to Mysteries".

View the list of all editions of the Triennale di Milano since 1933