Willi is a given name. Notable people with the given name include:
Willi Apel (1893–1988), German-American musicologistWilli Forst (1903–1980), Austrian actor, screenwriter, filmWilli Hennig (1913–1976), German biologistWilli Münzenberg (1889–1940), Communist political activistWilli Stoph (1914–1999), East German politicianWilli Tokarev (born 1934), Russian and former expatriate Russian-American singer-songwriterWilli Weber (born 1942), manager of German racing driversWilli Ziegler (1929–2002), a German paleontologist