RBSI
| Acronym | Definition |
|---|---|
| RBSI | Royal Bank of Scotland International |
| RBSI | Ralph Bunche Summer Institute (est. 1986; American Political Science Association) |
| RBSI | Royal Bank of Scotland Insurance (UK) |
| RBSI | Regina Business Systems, Inc. (Canada) |
| RBSI | Retail Business Survey Index (Korea Chamber of Commerce; South Korea) |
| RBSI | Regence BlueShield of Idaho (health insurance) |