Olejniczak
Olejniczak is a family name for the following people:
- Andrzej Olejniczak (* 1954), Polish jazz musician (tenor and soprano saxophone)
- Danuta Olejniczak (* 1952), Polish politician (citizens' platform)
- Dawid Olejniczak (* 1983), Polish tennis player
- Klaus Olejniczak (1945–2016), German pharmacologist
- Verena Olejniczak Lobsien (* 1957), German English studies specialist and university teacher
- Wojciech Olejniczak (* 1974), Polish politician (SLD) and economist