| ISTP | I Summon The Power 
| Others |
| ISTP | Index to Scientific Technical Proceedings
| Others |
| ISTP | Individually Shielded Twisted Pair
| Others |
| ISTP | Information Space Transfer Protocol
| Others |
| ISTP | Institute of Science Technology and Policy
| Others |
| ISTP | Integer Store and Pop
| Others |
| ISTP | Interdisciplinary Scientist Training Program
| Others |
| ISTP | International School of the Peninsula
| Others |
| ISTP | International Science and Technology Policy
| Others |
| ISTP | International Slave Trading Program
| Others |
| ISTP | International Society for Theoretical Psychology
| Others |
| ISTP | International Solar Terrestrial Physics
| Others |
| ISTP | International Summit on the Teaching Profession
| Others |
| ISTP | International Symposium on Tropospheric Profiling
| Others |
| ISTP | Internet Signaling Transport Protocol
| Others |
| ISTP | Introversion Sensing Thinking and Perceiving
| Others |
| ISTP | Introversion Sensing Thinking and Perception
| Others |
| ISTP | Introversion, Sensing, Thinking, and Perceiving
| Others |
| ISTP | Introvert Sensing Thinking and Perceiving
| Others |
| ISTP | Introvert Sensing Thinking Perceiving
| Others |
| ISTP | Introverted Sensing Thinking and Perceiving
| Others |
| ISTP | Introverted Sensing Thinking And Perceptive
| Others |
| ISTP | Introverted Sensing Thinking Perceiving
| Others |