Kostyuk
Kostjuk (Костюк), also Kostiuk is the family name of the following people:
- Denys Kostjuk (* 1982), Ukrainian racing cyclist
- Marta Kostjuk (* 2002), Ukrainian tennis player
- Mike Kostiuk († 2015), American football player
- Platon Kostjuk (1924-2010), Ukrainian neurophysiologist
