Sik or SIK may refer to:
- Sik District, Kedah, Malaysia
- Sik (federal constituency), Dewan Rakyat, Malaysia
- Sik, Iran, a village
- Sik (roller coaster), an amusement park ride at Flamingo Land, United Kingdom
- Sik, South Khorasan, a village in Iran
- Sik (goat), nickname for Netherlands NS Class 200 locomotives