• collegium (ancient Rome), a term applied to any association with a legal personality in ancient Rome.
• a significant example is the College of Pontiffs whose members were the highest-ranking priests of the state religion.
• a Latinized form of the Ancient Greek term hetaireia.
• collegium (ministry), in Imperial Russia, the equivalent of a ministry or government department.
• Collegium (school), in France, refers to a kind of college.
• In Scandinavia, an outdated spelling of kollegium and refers to dormitories, e.g.
• Hassagers Collegium
• Collegium Mediceum
• Harvard-Radcliffe Collegium Musicum

Also, the word college is derived from collegium.