Wilczyński (Polish pronunciation: [vilˈt͡ʂɨɲski]; feminine: Wilczyńska; plural: Wilczyńscy) is a surname of Polish-language origin. It derives either directly from Wilk (meaning "wolf") or from toponyms with this stem (Wilczyn, Wilczyna, Wilczyno).^[1] About 17,000 people use the surname in Poland, with the greatest number found in Ostrów Mazowiecka, Dębica, and Kielce. Notable people include:

• Daniel Wilczynski (born 1956), French footballer
• Ernest Julius Wilczynski (1876–1932), American mathematician
• Jan Kazimierz Wilczyński (1806–1885), Polish medical doctor, collector and publisher
• Józef Olszyna-Wilczyński (1890–1939), Polish general
• Katerina Wilczynski (1894–1978), Polish artist
• Konrad Wilczynski (1982), Austrian handball player
• Taylor Wilczynski (born 1990), Australian rower
• Tomasz Wilczyński (1903–1965), bishop of Warmia
• Vincent Wilczynski, American engineer and academic administrator
• Walter Wilczynski (1952–2020), American neuroscientist and ethologist
• Wojciech Wilczyński (1990), Polish footballer