| BASES | Baseball Academy for Sustaining Education in Sport 
| Others |
| BASES | Baseball And Softball Essential Skills
| Others |
| BASES | Bay Area Substance Education Services
| Others |
| BASES | Beam Approach Seeker Evaluation System
| Others |
| BASES | Booz Allen Sales Estimating System
| Others |
| BASES | British Association of Sport and Exercise Sciences
| Others |
| BASES | Building A Strong European Society
| Others |
| BASES | Building Academic Social and Employment Skills
| Others |
| BASES | Business Association of Stanford Entrepreneurial Students
| Others |
| BASES | Businesses Assisting Schools in Educating Students
| Others |