- Sadakazu Tanigaki
- Safe Haven Currencies
- Saint Helena Pounds
- Same Day Transaction
- Samoa Tala
- Sao Tome, Principe Dobras
- Satoshi
- Saudi Arabia Riyals
- Scalp
- Scalping
- Schengen Area
- Scrypt
- SDR
- Seborga Luigini
- SEC
- Secured Overnight Financing Rate (SOFR)
- Securitization
- SegWit
- Sell Wall
- Sell-Off
- Selling Pressure
- Sentiment
- Settlement Period
- Settlement Risk
- Seychelles Rupees
- SHA
- Shadow
- Sharpe Ratio
- Shitcoin
- Shoichi Nakagawa
- Shooting Star
- Short
- Short Position
- Short Squeeze
- Sidechain
- Sidelines
- Sideways Market
- Sideways Trend
- Sierra Leone Leones
- Simple Moving Average (SMA)
- Singapore Dollars
- Slippage
- Sloppy
- Slovakia Koruny
- Slovenia Tolars
- Smart Order Routing (SOR)
- Social Trading
- Society For Worldwide Interbank Telecommunications
- Soft Cap