YBS may mean:
- Yamanashi Broadcasting System (株式会社山梨放送 Kabushiki-gaisha Yamanashi Hōsō?)
- Yale Bright Star catalogue
- YBS, a disco artist who had the hit song "Happy Birthday" in 1979, see List of disco artists (S-Z)
- Yorkshire Building Society, the 2nd largest building society in the UK
- Yellow-bellied slider, a land and water turtle belonging to the family Emydidae.
- Yukon Bureau of Statistics
- Yonsei Educational Broadcasting System (연세교육방송국)