| ISFP | Improving Selection to the Foundation Programme 
| Others |
| ISFP | In-System Flash Programming
| Others |
| ISFP | Integrated Solutions For Ports
| Others |
| ISFP | Intercourse Sexual Feeling Playtime
| Others |
| ISFP | International Society for Fall Protection
| Others |
| ISFP | International Society for Fertility Preservation
| Others |
| ISFP | International Society for Fibrinolysis and Proteolysis
| Others |
| ISFP | International Society For Philosophers
| Others |
| ISFP | Introversion Sensing Feeling And Perceiving
| Others |
| ISFP | Introversion Sensing Feeling and Perception
| Others |
| ISFP | Introversion Sensing Feeling Perception
| Others |
| ISFP | Introvert Sensing Feeling Perceiving
| Others |
| ISFP | Introvert Sensor Feeler Perceiver
| Others |
| ISFP | Introverted Sensing Feeling And Perceiving
| Others |
| ISFP | Introverted Sensing Feeling Perceiving
| Others |
| ISFP | Introverted Sensitive Feeling Perception
| Others |
| ISFP | Iowa Strengthening Families Program
| Others |