Pier Giacomo Castiglioni

Pier Giacomo Castiglioni
Castiglioni in 1955
Born	22 April 1913 Milan, Italy
Died	27 November 1968 Milan
Nationality	Italian
Education	Politecnico di Milano
Known for	Architecture, design
Spouse(s)	Maria Coduri de Cartosio
Website	piergiacomocastiglioni.it

Pier Giacomo Castiglioni (22 April 1913 – 27 November 1968) was an Italian architect and designer.

Castiglioni was born on 22 April 1913 in Milan, in Lombardy in northern Italy. He was the second son of the sculptor Giannino Castiglioni and his wife Livia Bolla. His elder brother Livio and younger brother Achille were also architects.

Castiglioni studied architecture at the Politecnico di Milano, and graduated in 1937. In that year or in 1938 he started an architectural design practice with his brother Livio and Luigi Caccia Dominioni. He married Maria Coduri de Cartosio on 30 December 1942.

After the Second World War he and Livio worked with their younger brother Achille, who had graduated in architecture in 1944. Much of their work was in exhibition design, but they also carried out a number of architectural projects, including the reconstruction in 1952–53 of the Palazzo della Permanente (), which had been destroyed by bombing in 1943.

Livio Castiglioni left the practice in 1952 or 1953. From then until Pier Giacomo died – in Milan, on 27 November 1968 – he and Achille worked as a team; their designs are not attributable to either one of them.

Castiglioni taught life drawing at the Politecnico di Milano from 1964 to 1968.