Sif (disambiguation)
- 4484 Sif
- AirSial
- Central European Institute of Philosophy
- Italian Physical Society
- Love Live! School Idol Festival
- Rockingham County NC Shiloh Airport
- SIF Stadion
- Safety instrumented function
- Sandvikens IF
- Schools Interoperability Framework
- Science of Identity Foundation
- Selective Identification Feature
- Seychelles Islands Foundation
- Short Interframe Space
- Shropshire Islamic Foundation
- Siamou language
- Sif
- Sif (Dark Souls)
- Sif (Marvel Cinematic Universe)
- Sif (character)
- Sif Atladóttir
- Sif Glacier
- Sif Island
- Sif Mons
- Sif Ruud
- Sif Rykær
- Sif Ríkharðsdóttir
- Sif Saga
- Sif, Yemen
- Silkeborg IF
- Simara Airport
- Singapore International Foundation
- Small intensely fluorescent cell
- Society for Individual Freedom
- Somali Islamic Front
- Source Input Format
- Specialized investment fund
- Standard Interchange Format
- State Secretariat for International Finance
- Stattena IF
- Statutes in Force
- Stavanger IF
- Stocksunds IF
- Strategic Innovation Fund
- Stress intensity factor
- Strømsgodset IF
- Strømsgodset Toppfotball
- Supreme Indoor Football
- Swedish Union of Clerical and Technical Employees in Industry
- Syrian Islamic Front
- SÍF Sandavágur
- TF-SIF (Dash 8)
- TF-SIF (Dauphin 2)