- YO stands for York (postcode, United Kingdom)
- YO stands for Year Old
- YO stands for Yarn Over (knitting)
- YO stands for Years Old
- YO stands for Yugoslavia
- YO stands for Yoko Ono
- YO stands for Young Ones (Naturistische Activiteiten Vereniging)
- YO stands for Yeah, Okay
- YO stands for Youth Orchestra (various locations)
- YO stands for Youthful Offender
- YO stands for Young Offender (Ontario)
- YO stands for Yearly Output
- YO stands for Fuel Oil Barge (Self-Propelled)
- YO stands for District Barge, Fuel Oil (US Navy)
YO