Giovanni Antonio Colonna di Cesarò (1878–1940) was an Italian noble and politician who was the leader of the Social Democracy.

[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.

[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.

[6] 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",[7] or with those of "Krur" and "Breno").

[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.