OssI
| Acronym | Definition |
|---|---|
| OssI | Iron (linguistics) |
| OssI | Operations Support System Interface |
| OssI | Oracle Secure Search Initiative |
| OssI | Open Source Software Institute |
| OssI | Office of Security and Strategic Information (US DHHS) |
| OssI | Outback Steakhouse, Inc. (stock symbol) |
| OssI | Office of Security Services International |
| OssI | Operation Support Systems Interface |
| OssI | Office of Supplemental Security Income (Social Security Administration) |