Zillich is a German surname. Notable people with the surname include:
Heinrich Zillich (1898–1988), German-language Romanian writer Klaus Zillich (1942–2026), German architect, landscape architect, urban planner and academic Steffen Zillich (born 1971), German politician
See also Connor Zilisch (born 2006), American racing driver Werner Zillig (born 1949), German linguist and author Winfried Zillig (1905–1963), German composer, music theorist and conductor