| Acronym | Definition |
|---|
| SIP | Session Initiation Protocol |
| SIP | Single Inline Package |
| SIP | Savings Investment Plan |
| SIP | Serial Interface Protocol |
| SIP | System(s) Implementation Plan |
| SIP | System(s) Integration Plan |
| SIP | State Implementation Plan (EPA) |
| SIP | Structural Insulated Panel (construction) |
| SIP | School Improvement Plan |
| SIP | Systematic Investment Plan (finance) |
| SIP | Sociedad Interamericana de Prensa (Spanish: Inter-American Press Association; Miami, FL) |
| SIP | System in a Package |
| SIP | Share Incentive Plan |
| SIP | Summer Internship Program |
| SIP | Stay-In-Place (engineering construction) |
| SIP | Suzhou Industrial Park (Suzhou, China) |
| SIP | Sickness Impact Profile |
| SIP | Still in Progress |
| SIP | Sterilization in Place (drug/medicine production) |
| SIP | Soft Input Panel |
| SIP | Steam in Place |
| SIP | Silicon Intellectual Property |
| SIP | School Improvement Partner (UK education) |
| SIP | SPA Interface Processor (Cisco) |
| SIP | SMDS Interface Protocol |
| SIP | Shelter In Place |
| SIP | Strategic Investment Program (Australian government) |
| SIP | Submission Information Package |
| SIP | Society for Invertebrate Pathology (Knoxville, TN) |
| SIP | Semiconductor Intellectual Property |
| SIP | Single Inline Package (semiconductor industry) |
| SIP | Simple Internet Protocol |
| SIP | Social Inclusion Partnership |
| SIP | Stable-Isotope Probing |
| SIP | System Improvement Plan |
| SIP | Social Information Processing |
| SIP | Service Improvement Program |
| SIP | Shelter Implementation Plan |
| SIP | System Improvement Program (SINCGARS) |
| SIP | System Improvement Program |
| SIP | Signal/Image Processing |
| SIP | Secure Internet Programming (Princeton University) |
| SIP | Stickler Involved People |
| SIP | Sabic Innovative Plastics |
| SIP | Società Italiana di Psichiatria |
| SIP | Sociedad Interamericana de Psicologia |
| SIP | Sindicato de Industriales de Panama (Spanish: Panamanian Industrialists Society, Panama) |
| SIP | Session Invitation Protocol (Internet conferencing, telephony) |
| SIP | Schools Integration Project |
| SIP | Strongly Implicit Procedure |
| SIP | Software Installation Plan |
| SIP | Student Internship Programme |
| SIP | Strategic Inflection Point |
| SIP | Self-Inspection Program |
| SIP | Standard Interchange Protocol (3M delevolped data transfer protocol for library systems.) |
| SIP | State Implementation Program |
| SIP | Surf in Peace |
| SIP | Server Interface Pod (Dell/Avocent) |
| SIP | Sales Incentive Plan |
| SIP | Sosyalist Iktidar Partisi (Party of Socialist Power; now Türkiye Komünist Partisi) |
| SIP | System Implementation Plan |
| SIP | Streamlined Inspection Program |
| SIP | Shut-In Pressure |
| SIP | Standard Inspection Procedure |
| SIP | Service Implementation Plan |
| SIP | Simferopol, Ukraine - Simferopol (Airport Code) |
| SIP | Sector Investment Programmes |
| SIP | Società Idroelettrica Piemonte |
| SIP | Ship In Place |
| SIP | Serial Interface Processor (Cisco) |
| SIP | Structural Integrity Program |
| SIP | Standardization Instructor Pilot |
| SIP | Sooner If Possible (Similar to ASAP) |
| SIP | Southern Independence Party |
| SIP | Space Interferometry Mission |
| SIP | Statistically Improbable Phrase (Amazon.com) |
| SIP | Symbolic Input Program |
| SIP | Site Implementation Plan |
| SIP | SINCGARS Improvement Program |
| SIP | Spontaneous Intestinal Perforation (newborn condition) |
| SIP | Separation Incentive Pay |
| SIP | Single Integrated Picture |
| SIP | System Integration Plan |
| SIP | Senior Inspector of Police |
| SIP | Strain Isolation Pad |
| SIP | Security Investment Program |
| SIP | Standard Interface Panel |
| SIP | Simulated Input Processor |
| SIP | SCSI Interlock Protocol |
| SIP | Statewide Implementation Program |
| SIP | Stay in Prayer |
| SIP | Sulfoisophthalate |
| SIP | Software Integration Plan |
| SIP | System Initialization Table |
| SIP | Support Information Package (USAP) |
| SIP | Société Interaméricaine de La Presse (French: Inter American Press Society) |
| SIP | Soul Influenced Product (nightclub in Geneva, Switzerland) |
| SIP | Special Investigative Panel |
| SIP | Safety Implementation Plan |
| SIP | Sprint Internet Passport |
| SIP | Station Independence Program (PBS) |
| SIP | Soft Intellectual Property (integrated circuit designs) |
| SIP | Satellite Interceptor Program |
| SIP | Software Improvement Program |
| SIP | Stationary Inflection Point |
| SIP | Segment Interface Protocol |
| SIP | Semporna Islands Park (Malaysia) |
| SIP | Smart Installment Plan (Citibank, Pakistan) |
| SIP | Station Information Packet |
| SIP | Stability Improvement Program |
| SIP | Scanner Interface Processor |
| SIP | Systems Integration Panel |
| SIP | SOGS Invocable Procedure |
| SIP | Stop Internet Plagiarism |
| SIP | Systems Infrastructure Project |
| SIP | Standard Initial Provisioning |
| SIP | Scientific Investigations Plan |
| SIP | Stochastic Information Packet |
| SIP | States Inventory Project |
| SIP | Satellite Image Processor |
| SIP | Self-Igniting Phosphorus |
| SIP | Shuttle Interface Panel |
| SIP | SACLANT Intelligence Plan |
| SIP | Shield Isolation Point |
| SIP | Ship Instrumentation Package (US Navy) |
| SIP | SMDC Interface Protocol |
| SIP | System Implementation Posture (system documentation) |
| SIP | Site Investigation Planning |
| SIP | Seniors Info Plus |
| SIP | Signal Inline Package |
| SIP | Site Information Processor |
| SIP | Substituent Interaction Parameter |
| SIP | Step Increase Program |
| SIP | Systems Intelligence Products Co., Ltd (Japan) |
| SIP | Small Inverse Problem |
| SIP | Synchronized Interleaved Polling (Sprint) |
| SIP | Status Indicator Panel |
| SIP | System/Ship Improvement Plan/Program |
| SIP | Systems Integration and Protection |
| SIP | Security Improvement Process |
| SIP | Subsystem Implementation Plan |
| SIP | Submission Input Processing |
| SIP | Staging Initiation Package |
| SIP | Standard Installation Plan |
| SIP | Special Intelligence Processing |
| SIP | Singe Inline Pin |
| SIP | Seasonal to Interannual Prediction (World Meteorological Organization) |
| SIP | Spanish, Italian and Portuguese (various schools) |
| SIP | Second Intermediate Period |
| SIP | System Idle Process (computing) |
| SIP | Spanish Immersion Program (education) |
| SIP | School Intervention Program (various schools) |
| SIP | Special Interest Project (various organizations) |
| SIP | System Informacji Przestrzennej (Polish: Spatial Information System) |
| SIP | Swords into Plowshares |
| SIP | Software in Partnership (est. 2002) |
| SIP | Software India Pvt. Ltd. |