GYS may refer to:
People Gys van Beek (1919–2015), Dutch resistance member during World War II Leda Gys (1892–1957), Italian film actress Robert Gys (1901–1977), French art director
Other uses Glycogen synthase Great Yorkshire Show, an agricultural show in England Guangyuan Panlong Airport, Sichuan, China Operation GYS, an Israeli operation conducted during the 1948 Arab–Israeli War