- Somalia, Assisting the African Union in -
- Standardization, Committee for -
- Standby Force, Contributing to the establishment of an African -
- Strategic lift capabilities
- Senior Civilian Representative in Afghanistan, NATO's -
- Security tasks, NATO’s fundamental -
- Serbia, NATO’s relations with -
- Sweden, NATO’s relations with -
- Switzerland, NATO’s relations with -
- SATCOM Post-2000
- Science for Peace and Security
- Security Committee (SC)
- SILK-Afghanistan
- Situation Centre at NATO’s Headquarters (SITCEN)
- Small arms and light weapons (SALW) and mine action
- Smart Defence
- Standardization
- Strategic Airlift Capability (SAC)
- Strategic Airlift Interim Solution (SALIS)
- Strategic Concepts
- Strategic sealift
- Summit meetings
- Supreme Allied Commander Europe (SACEUR)
- Supreme Allied Commander Transformation (SACT)
- Science and Technology Organization (STO), NATO -
- Secretary General, The NATO -