| Term Start: | February 1922 |
| Term End: | 1924 |
| Primeminister: | Benito Mussolini |
| Successor: | Costanzo Ciano |
| Office1: | Minister of Post and Telegraphs |
| Term Start1: | 15 May 1921 |
| Term End1: | 1921 |
| Primeminister1: | Giovanni Giolitti |
| Birth Name: | Giovanni Antonio Francesco Giorgio Landolfo Colonna Romano |
| Birth Date: | 1878 |
| Party: | Social Democracy |
| Spouse: | Barbara Antonelli |
| Children: | Simonetta Colonna di Cesarò |
Giovanni Antonio Colonna di Cesarò (1878–1940) was an Italian noble and politician who was the leader of the Social Democracy. He also served as the minister of post and telegraphs between 1922 and 1924 in the Mussolini Cabinet. He was known as the "anthroposophist duke".
Colonna was born in 1878.[1] From 1907, he started his political career and became a member of the parliament in the period 1909–1921.[2] He founded and published a magazine entitled Rassegna contemporanea which is among the early anthroposophical publications.[1] As of 1914, he was a member of the Italian National Olympic Committee.[3]
Following the general elections on 15 May 1921 Colonna was named as the minister of post and telegraphs in the cabinet led by Giovanni Giolitti.[2] He was appointed minister of posts to the cabinet headed by Luigi Facta on 25 February 1922, but he resigned from office soon being succeeded by Luigi Fulci in the post.[4] In 1922, Colonna established the Social Democracy party and joined the government of Benito Mussolini as the minister of post and telegraphs, which he held until his resignation in February 1924.[1] He was replaced by Costanzo Ciano in the post.[5] Following this incident, Colonna retired from politics.[1] His another magazine was Lo Stato Democratico (Italian: The Democratic State) which also published anthroposophical articles.
Close to the environments of esotericism and Roman neopaganism of those years, Colonna was part of the UR Group which was established in 1927 (perhaps with the pseudonym of "Arvo",[6] or with those of "Krur" and "Breno").[7]
Colonna was married to Barbara Antonelli, a noblewoman of Russian origins, and their daughters were Mita and Simonetta Colonna di Cesarò.[8] He died in 1940.[9]
Colonna was an advocate of colonialism and democratic imperialism.[1] During World War I he supported the intervention of the Italian Empire through his writings in Rassegna contemporanea which also reflected his radical national views.[1] However, Colonna did not have a consistent political ideology. Instead, he adopted different political views depending on the conditions.[1] Following his retirement from politics Colonna became an anti-Fascist.[1]