Musculus may refer to:
Andreas Musculus (also Andreas Meusel; 29 November 1514 – 29 September 1581) was a German Lutheran theologian and Protestant reformer. The name Musculus is a Latinized form of Meusel.
Musculus was born in Schneeberg, Saxony, Schneeberg, "general ...
(1514–1581), German Lutheran theologian
* Heinrich Musculus
(b. 1868), Swedish-Norwegian businessperson
*Wolfgang Musculus (1497–1563), German Reformed theologian
*Musculus (bivalve), ''Musculus'' (bivalve), a genus of mussels
*Blue whale, ''Balaenoptera musculus'', the blue whale
*House mouse, ''Mus musculus'', the house mouse