Karel Brančik[nb 1] (13 March 1842 – 18 November 1915) was a Hungarian doctor and naturalist.

He practised medicine at Trenčín and was interested in entomology, malacology and botany.

In 1913 he founded the museum at Trenčín.

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.