Collegium Musicum 90 is an English baroque orchestra playing on period instruments. It was founded by violinist Simon Standage and conductor Richard Hickox in 1990 and was jointly directed by them (either together or separately) until the death of Hickox in November 2008.

Collegium Musicum means something like musical guild and was used generically as the name of musical societies and ensembles in the baroque era, and is sometimes used similarly today by ensembles playing early music.