Wladyslaw Zajaczkowski (April 12, 1837 in Strzyzów near the Rzeszów – October 7, 1898 in Lwów) was a Polish mathematician.
Professor of Warsaw Main School, Imperial University of Warsaw (now University of Warsaw), Technical Academy in Lviv (now Lviv Polytechnic; twice a rector).
Member of Polish Academy of Learning and French Academy of Sciences.
He was specialising mainly in mathematical analysis and differential equations.