- YSA stands for Youth Service America
- YSA stands for Young Single Adult
- YSA stands for Young Socialist Alliance (youth group)
- YSA stands for Yleinen Suomalainen Asiasanasto (Finnish General Thesaurus)
- YSA stands for Young Scientists of Australia
- YSA stands for Youth Studies Australia (Peer-Reviewed Academic Journal, University of Tasmania)
- YSA stands for Youth Savings Account
- YSA stands for Youth South Africa (forum)
- YSA stands for Your Secret Admirer
- YSA stands for Youth Stake Activities (Roosevelt, UT)
YSA