| Acronym | Definition |
|---|
| YSAS➣Youth Substance Abuse Service |
| YSAS➣Yaw Stability Augmentation System (aviation) |
| YSAS➣Young Sikh Association Singapore |
| YSAS➣Young Scientist Award Session (Society for Experimental Biology; UK) |
| YSAS➣Yanmar Sales and After Sales Services |
| YSAS➣Young Society Against Swearing |