Carl Nielsen (disambiguation)

Carl Nielsen was a Danish composer.

Carl Nielsen may also refer to:
 * Carl O. Nielsen (1868–1950), Norwegian businessperson
 * Carl Nielsen (rower) (1930–1991), Danish rower
 * Carl Nielsen Academy of Music
 * Carl Nielsen Edition, the composer's works in a bilingual practical-scientific version on a music philological basis
 * Carl Nielsen International Music Competition, a competition for classical musicians held in Odense, Denmark
 * Carl Nielsen Museum, a museum dedicated to the life of the composer