Sis may refer to: An abbreviation of sister. Kozan, Adana, a city in Turkey. An alternative for Sissy Silicon Integrated Systems (SiS), a semiconductor design and manufacturing company based in Taiwan. Sis, a GMA Network show in the Philippines. SIS, American University's School of International Service, located in Washington D.C. Schengen Information System, used by European police forces.… (More on Sis)