Kubiak is a Polish surname. Notable people with the surname include:
Clifford Kubiak, American biochemist
Dan Kubiak, Texas politician
Riggs Kubiak, CEO and Founder, Honest Buildings
Gary Kubiak, American football coach
Jim Kubiak, American football coach
Marcin Kubiak, Polish astrophysicist
MichaĆ Kubiak, Polish volleyball player
Ryszard Kubiak, Polish rower
Ted Kubiak, American baseball player
Zygmunt Kubiak, Polish writer