- S
- S2
- S-PLUS
- S-Lang
- SAIL
- SAKO
- SAM76
- SAS
- Sather
- Scala
- SCAR
- Scheme
- Script.NET
- Sed
- Seed7
- Self
| - SETL
- SIGNAL
- SiMPLE
- SIMPOL
- SIMSCRIPT
- Simula
- SISAL
- Slate
- SLIP
- SMALL - SMALL Machine Algol Like Language
- Small
- Smalltalk
- Smalltalk YX
- SNOBOL - String Oriented Symbolic Language
- Snowball
| - SPARK
- Spice
- SPIN
- SP/k
- SPL/1 - aka SPL/I
- SPS (1620) - observe IBM 1620
- Squeak
- SR
- SSL
- Standard ML
- StringLang
- Subtext
- SuperCollider
- Suneido
- SYMPL
- SyncCharts
- Synergy/DE
- Syx
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