ISSL
| Acronym | Definition |
|---|---|
| ISSL | IBM Software Services for Lotus |
| ISSL | International Sunday School Lesson (Christianity) |
| ISSL | Initial Spares Support List |
| ISSL | Index to Sumerian Secondary Literature |
| ISSL | Internet Solutions Services Ltd. (UK; website developers) |
| ISSL | Integrated Services Over Specific Links |
| ISSL | International School São Lourenço (Portugal) |