| Karel Brančik | |
| Birth Date: | 13 March 1842 |
| Birth Place: | Stará Bystrica, Austrian Empire (today in Slovakia) |
| Death Place: | Trenčín, Austria-Hungary (today in Slovakia) |
| Nationality: | Hungarian |
| Occupation: | doctor and naturalist |
Karel Brančik (13 March 184218 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.