| ISSL | IBM Software Services for Lotus 
| Others |
| ISSL | Immediate Skill Shortage List
| Others |
| ISSL | Impel Service Solutions Limited
| Others |
| ISSL | Independent Schools of St Louis
| Others |
| ISSL | Independent Schools of St. Louis
| Others |
| ISSL | Index to Sumerian Secondary Literature
| Others |
| ISSL | Information and Systems Sciences Lab
| Others |
| ISSL | Information Systems Security Laboratory
| Others |
| ISSL | Initial Spares Support List
| Others |
| ISSL | Intelligent Signal Systems Laboratory
| Others |
| ISSL | Intelligent Structures and Systems Lab
| Others |
| ISSL | Intelligent Structures and Systems Laboratory
| Others |
| ISSL | Inter-Societies Soccer League
| Others |
| ISSL | Interface and Surface Science Laboratory
| Others |
| ISSL | International School of Saint Lucia
| Others |
| ISSL | International Society for Social Law
| Others |
| ISSL | International Speed Skating League
| Others |
| ISSL | International Stemcell Services Ltd
| Others |
| ISSL | International Sunday School Lesson
| Others |
| ISSL | International Sunday School Lessons
| Others |
| ISSL | Internet Solutions Services Limited
| Others |
| ISSL | Internet Solutions Services, LTD.
| Others |
| ISSL | Iowa Standards for School Leaders
| Others |
| ISSL | itial Spares Support List
| Others |