| ISOP | Illinois Society of Periodontists 
| Others |
| ISOP | Impermanent Society of Philadelphia
| Others |
| ISOP | Incentive Stock Option Plan
| Others |
| ISOP | Infantile Scoliosis Outreach Program
| Others |
| ISOP | Insurance Society of Philadelphia
| Others |
| ISOP | Insured Security Option Plan
| Others |
| ISOP | Integrated Solutions for Optimized Performance
| Others |
| ISOP | Integrated Sustainable Operational Platform
| Others |
| ISOP | Interim Structural and Operational Plan
| Others |
| ISOP | International School of Paphos
| Others |
| ISOP | International School Of Paphos, Cyprus
| Others |
| ISOP | International School of Poznan
| Others |
| ISOP | International Society for Ophthalmic Pathology
| Others |
| ISOP | International Society For Organ Preservation
| Others |
| ISOP | International Society of Pharmacometrics
| Others |
| ISOP | International Society Of Pharmacovigilance
| Others |
| ISOP | International Society of Presbyopia
| Others |
| ISOP | International Society of Protistologists
| Others |
| ISOP | International Student Orientation Program
| Others |
| ISOP | International Student Orientation Programme
| Others |
| ISOP | International Students Orientation Programme
| Others |
| ISOP | International Symposium on Organic Photochromism
| Others |
| ISOP | Irredundant Sum Of Products
| Others |
| ISOP | Israel Society of Pharmacovigilance
| Others |
| ISOP | Italian Series of Poker
| Others |