| SSDI | Social Security Disability Insurance | 社会保障残疾保险 |
| SSDI | Social Security Death Index | 社会保障死亡指数 |
| SSDI | Supplemental Security Disability Income | 补充保障残疾收入 |
| SSDI | Social Security Disability Income (common, but incorrect) | 社会保障残疾收入（普通，但不正确） |
| SSDI | Ship System Definition & Index | 系统的定义和索引。船 |
| SSDI | Standardized Systems Database Interface | 标准化系统数据库接口 |