Žilys (or Zilis) is a Lithuanian surname. Notable people with the surname include: Žilys: Birutė Žilytė-Steponavičienė (1930–2024), Lithuanian graphic artist Gintas Žilys (1941–2012) was a prominent Lithuanian theatre director, opera creator Juozas Žilys (1942–2024), lawyer, judge of the Constitutional Court of Lithuania Vincas Žilys (1898–1972), Lithuanian general Zilis: Shivon Zilis (born 1986), Canadian technology executive