Serg may refer to:
- Van Serg (crater), a lunar crater named for a pseudonym
- Serg., taxonomic author abbreviation of Lidia Palladievna Sergievskaya (1897–1970), Soviet botanist, professor, and herbarium curator
- Serg., abbreviation for Sergeant, a police and military rank
- Serg Bell (born 1971), Singaporean businessman entrepreneur, investor and speaker