B
- Blue Velvet - Upper
- Bluff Cove Trail
- Bluff Knoll
- Bluffs Regional Park Trail
- Blumental
- Boardwalk Loop
- Boar of Badenoch - Central Couloir
- Bob Graham Round: 1 Keswick to Threlkeld
- Bob Graham Round: 2 Threlkeld to Dunmail
- Bob Graham Round: 3 Dunmail to Wasdale
- Bob Graham Round: 4 Wasdale to Honister
- Bob Graham Round: 5 Honister to Keswick
- Bob Jones Bike Trail
- Bob Marshall Traverse
- Bob's and Lower Hull's Downhill Combo
- Bob's Cove Track
- Bob's Figure-8
- Bob's Knob
- Bobsled
- Bobsled and Floppy Bunny Double Loop
- Bobsled Loop
- Bobsled Loop
- Boca Chita Trail
- Bocchetta di Campello
- Bochèta Cantòn
- Bochèta de Trèla
- Bodega Head Trail
- Bodenstein Alm
- Body Bag
- Boggy Draw Loop
- Bogus Basin Road Climb
- Bogus Basin Up-Track
- Boiling Springs Lake and Terminal Geyser
- Boirolo / Tresivio, Bocchetta Mara
- Bois de Boulogne
- Bois de Vincennes
- Bois du Bouchet
- Boise Greenbelt: Ann Morrison to Barber Park
- Boisses Couloir
- Bold Ridge Trail
- Bolinas Ridge and Olema Valley Loop
- Bolinas Ridge Trail North
- Bombay Chute
- Bomb's Away
- Bomb Tram Cliff
- Bonanza Mine Trail
- Bonascre Saquet
- Bonatti Hut to Grand St Bernard Monastery
- Bondi -> Caprazoppa Loop
- Bondi -> Xmen Loop
- Bonecrusher -> Fast and Loose
- Boneyard
- Boneyard
- Boneyard
- Bongo Bongo
- Bonkers
- Bonneval to the Carro Hut
- Bonneville Shoreline Trail: Tunnel Springs to I-80
- Bonneville Shoreline Trail: Tunnel Springs to I-80
- Bonningtons Ski Traverse Day 1 - Bombi Summit to Grassy Hut
- Bonningtons Ski Traverse Day 2 - Grassy Hut to Steed Hut
- Bonningtons Ski Traverse Day 3 - Steed Hut to Copper Hut
- Bonningtons Ski Traverse Day 4 - Copper Hut to Porto Rico
- Bonnington Traverse: Day 1
- Bonnington Traverse: Day 2
- Bonnington Traverse: Day 3
- Bonnington Traverse: Day 4
- Bonnington Traverse: Day 5
- Bonsai
- Bony d'Envalira
- Bonzai
- Boogieman Loop
- Boomerang
- Boondocks
- Boone Fork Trail Loop
- Boone Fork Trail Loop
- Boot Chutes
- Bootleg Canyon: Armageddon -> Kevorkian -> Diva Shuttle
- Bootleg Canyon: Boy Scout -> Girl Scout Shuttle
- Bootleg Canyon: G-String Shuttle