IPP
- David Ipp
- IP (complexity)
- Illinois Prairie Path
- Imprisonment for public protection
- Independent power producer
- India Pride Project
- Individual Pension Plan
- Induratio penis plastica
- Insilicos Proteomics Pipeline
- Institute of Particle Physics
- Integrated Performance Primitives
- Intellectual Property Protection
- Intermountain Power Plant
- International Player Pathway
- International price program
- Internet Printing Protocol
- Ionospheric pierce point
- Ip, Sălaj
- Iran Prosperity Project
- Irish Parliamentary Party
- Isopentenyl pyrophosphate
- Istehkam-e-Pakistan Party
- Istituto per la Protezione delle Piante
- Life Cycle Thinking
- Max-Planck-Institut für Plasmaphysik
- Nob Yoshigahara Puzzle Design Competition