Karel (or Karol ou Karl or Carolus) Brancik (or Brancsik) (13 March 1842, Stará Bystrica -18 November 1915, Trencín) was a Hungarian doctor and naturalist.
He practised medicine at Trencín and was interested in entomology, malacology and botany.
In 1913 he founded the museum at Trencín.
He made a large collection of Coleoptera which was acquired by the Vienna entomologist Eduard Knirsch (1869–1955) before his collection was acquired by the Field Museum of Natural History, Chicago.