- Musca - a small constellation in the polar region of the southern hemisphere near the Southern Cross and Chamaeleon
--1 is a kind of constellation
- Musca, genus Musca - type genus of the Muscidae: houseflies
--2 is a kind of arthropod genus
--2 is a member of Muscidae, family Muscidae
--2 has members: housefly, Musca domestica - Musca, genus Musca - type genus of the Muscidae: houseflies