SSDI
| Acronym | Definition |
|---|---|
| SSDI | Social Security Disability Insurance |
| SSDI | Social Security Death Index |
| SSDI | Social Security Disability Income (common, but incorrect) |
| SSDI | Sharp Software Development India Pvt. Ltd. (est. 1999) |
| SSDI | Supplemental Security Disability Income |
| SSDI | Solid State Devices, Inc. (California) |
| SSDI | Ship System Definition & Index |