S
- Sabine River
- Saxon River
- Saxton River
- Seaforth River
- Seaward River
- Selwyn River / Waikirikiri
- Serpentine River
- Severn River
- Shag River
- Shenandoah River
- Sherry River
- Shin River
- Shotover River
- Sinclair River
- Skeet River
- Slate River
- Smite River
- Smoothwater River
- Smyth River
- Snow River
- Snowy River
- South Mathias River
- South Ohau River (2)
- South Opuha River
- Southern Waiotauru River
- Spey River (Southland)
- Spey River (Tasman)
- Spoon River
- Spray River
- Stafford River
- Stanley River (Canterbury)
- Stanley River (Tasman)
- Stanton River
- Station Creek or Sheriff River
- Stillwater River
- Stony River
- Hangatahua (Stony) River, Taranaki
- Te Wharau (Stony) River, West Coast
- Stour River
- Strauchon River
- Styx River (West Coast)
- Styx River (North Canterbury)
- Styx River (Canterbury)
- Styx Creek, in Otago
- Swift River
- Swin Burn
- Swin River
Read more about this topic: List Of Rivers Of New Zealand