Giulio "Delminio" Camillo (ca. 1480–1544) was an Italian philosopher. He is best known for his Theatre of Memory, described in his posthumously published work L’Idea del Theatro.
Camillo was born around 1480 in Friuli, in the north-east of Italy, and probably spent his childhood in Portogruaro. He took his family name, Delminio, from the birthplace of his father, in Dalmatia (in present-day Croatia). He studied philosophy and jurisprudence at the University of Padua in the years around 1500, and subsequently taught eloquence and logic at San Vito, an academy in Friuli. In 1508 he was involved in the short-lived Accademia Liviana at Pordenone. The Academy attracted an eclectic mix of brilliant and radical thinkers. Here, Camillo would have come in contact with astronomer and physician, Girolamo Fracastoro, and the poets, Giovanni Cotta and Andrea Navagero.
Around the first decade of the sixteenth century Camillo lived in Venice, where he was in close contact with some of the most influential writers and artists of Europe. He stayed near the house of the famous printer, Aldus Manutius, in the Sestiere di San Polo, in the centre of the city. He knew the philologist Desiderius Erasmus (although Erasmus and Viglius did not show much affection for Camillo's mysticisms) and worked with the painter Titian. He was part of the cultural circle that included Pietro Aretino and Pietro Bembo and had personal ties with the architect Sebastiano Serlio and his family. During this time, Camillo spent considerable care in charting regional differentiations in the Friulian dialect and was a champion of the local use of Italian, rather than Ladin. Throughout this time he also worked on his ideas for the Theatre.
Camillo is believed to have held a chair of Dialectics at the University of Bologna from around 1521 to 1525; he attended the coronation of Charles V in 1529.