S
- Sunset Rock
- Sunset Trail
- Sunshine Bowl
- Sunshine Trail
- Sun Steps
- Suntop -> Skookum Flats Shuttle
- Super 8 Ski Tour
- Super Couloir
- Superior Hiking Trail
- SUPER PANORAMA FREERIDE
- Super Pipe
- Super S
- Super Spatule
- Super Star
- Supertubo
- Sure Shot
- Surfbird Mountain
- Surveyor's Ridge Loop
- Sushi Roll
- Sutherland Trail Out-and-Back
- Sutherland Trail Out-and-Back
- Suzy's Cave
- Sven's TRTER 50 test
- Swampy -> Mrazek Shuttle
- S-Way – Carosello 3000 Bike Park Livigno
- Sweeney's Switchbacks and John's Trail
- Sweetwater Loop
- Sweetwater Preserve
- Sweetwater Preserve
- Sweetwater Preserve Trail System
- S Weissfluhjoch ridge to Haupertali
- SW Face Sacajawea Peak
- Swiftcurrent Mountain
- Swiftcurrent Pass Trail
- Swinger
- Swiss 4000ers: Fluchthorn, 3795m
- Swiss 4000ers: Strahlhorn, 4190m.
- Swiss 4000ers: Weissmies 4017m
- Swiss 4000ers: Wiessmies, 4017m alternative route from the S
- Swiss Cheese
- Swiss Horn
- Swiss Side Loop
- Swiss Transalp: Adelboden to Lauenen
- Swiss Transalp: Grindelwald to Leissigen
- Swiss Transalp: Haute-Nendaz to Mauvoisin
- Swiss Transalp: Intertkirchen to Grindelwald
- Swiss Transalp: Lauenen to Haute-Nendaz
- Swiss Transalp: Leissigen to Adelboden
- Swiss Transalp: Lucerne to Intertkirchen
- Swiss Transalp: Mauvoisin to Aosta
- Switcheroo
- Switchgrass Trail System
- Switzer Falls
- Swope Park Loop
- Sycamore Cove
- Sycamore Cove Loop
- Sydenham Hill Wood to Dulwich Village
- Syllamo: Bad Branch Trail
- Syllamo: Bald Scrappy Trail
- Syllamo: Jack's Branch Trail
- Syllamo: Scrappy Mountain Trail
- Syllamo: White River Bluff Trail
- Syncline Trails: Big Loop
- Syncline Trails: Big Loop
- Syncline Trails: Hidden Canyon Loop
- Syncline Trails: Little Maui to Little Moab Loop
- Syncline Trails: Little Moab Loop