Olejniczak

Olejniczak is a Polish surname, it may refer to:
 * Cezary Olejniczak (born 1972), Polish politician
 * Dawid Olejniczak (born 1983), Polish tennis player
 * Dominic Olejniczak (1908–1989), American mayor
 * Janusz Olejniczak (born 1952), Polish pianist and actor
 * Michał Olejniczak (born 2001), Polish handball player
 * Stan Olejniczak (1912–1979), American football player
 * Wojciech Olejniczak (born 1974), Polish politician