ISP (disambiguation)
- Higher Institute of Philosophy
- ISP
- ISP Formal Verification Tool
- ISP Sports
- Idaho State Police
- Illinois State Police
- Image processor
- In-system programming
- Independence for Scotland Party
- Independent Socialist Party (disambiguation)
- Indiana State Police
- Information Society Project
- Information Systems Professional
- Institute of Southern Punjab
- Instituto Superior Politécnico
- Integrated Service Provider
- Integrated science program
- Interface segregation principle
- International School of Panama
- International School of Paris
- International School of Prague
- International Science Programme
- Internet service provider
- Intesa Sanpaolo
- Iowa State Patrol
- Iowa State Penitentiary
- Islip railway station
- Long Island MacArthur Airport
- National Inspectorate of Strategic Products (Sweden)
- Petnica Science Center
- Polarization in astronomy
- Sovereign and Popular Italy
- Specific impulse