- BAY stands for Bank of Ayudhya (Bangkok, Thailand)
- BAY stands for Baia Mare, Romania (airport code)
- BAY stands for Brooklyn Atlantic Yards (New York)
- BAY stands for Burnham Area Youth (Bridgwater, Somerset, England, UK)
- BAY stands for Belle Aire Youth (Tennessee)
- BAY stands for Bethlehem Area YMCA
- BAY stands for Boston Avenue Youth
- BAY stands for Bais Ahavas Yisroel
- BAY stands for Brockton Alliance for Youth
- BAY stands for Buy Another Yearly
BAY