S1, S01, S.I, S-1, S.1, Š-1 or S 1 may refer to:
- ACPI S1 power state, in computing; see Advanced Configuration and Power Interface § Global states
- Apple S1, integrated computer used in the Apple Watch
- Canon PowerShot S1 IS, a 2004 3.2 megapixel digital camera
- FinePix S1 Pro, a 2000 interchangeable lens digital single-lens reflex camera by Fujifilm
- Nikon Coolpix S1, a digital camera
- S1 Corporation, an American software development company
- S1 Core, a microprocessor-core
- S1 MP3 Player
- Samsung Galaxy S (2010 smartphone)
- Sendo S1, a Sendo mobile phone model
- Siemens S1, a Siemens mobile phone
- Sony BDP-S1, a first generation Blu-ray Disc (BD) Player
- S1, an EPC in an LTE/4G network
Vehicles
Aircraft
- Blackburn Buccaneer S.1 jet naval strike aircraft
- Focke-Wulf S 1, a German Focke-Wulf aircraft
- Fokker S.I, a 1919 Dutch primary trainer aircraft
- Hopfner S-1, a Hopfner aircraft
- Letov S-1, a 1920 Czechoslovak surveillance aircraft
- Loening S-1, a United States Army Air Service seaplane
- Loughead S-1 Sport 1920 US biplane
- Martinsyde S.1, a 1914 British biplane aircraft
- Pantsir-S1, a Russian anti-aircraft system
- Pitts S-1 aerobatic biplane
- S-1 Loening, a United States Army Air Service seaplane
- SSBS S1, a French experimental rocket
- Swift S-1, a 1991 Polish single seat aerobatic glider
S1 may refer to :
S1 may refer to :
S01 may refer to :
- Akai S01, an Akai synthesizer
- ATC code S01 Ophthalmologicals, a subgroup of the Anatomical Therapeutic Chemical Classification System
- HMS Porpoise (S01), a 1956 Porpoise-class submarine of the Royal Navy
- MULTI-S01, an encryption algorithm based on a pseudorandom number generator