Janek is a given name. Johnny in Polish and Slovak.

Janek is a family name.

• Ivan Janek (born 1986), Slovak football player
• Jolanta Janek (born 1963), Polish diplomat
• Kyle Janek, M.D. (born 1958), former Republican member of the Texas Senate
• Shane Janek a.k.a. Courtney Act, Australian entertainer
• Tomas Janek, Slovak professional ice hockey player

• Janek (opera)