M
- Maah Daah Hey Trail
- Macaroni Chute
- Macedon Ranges Walking Trail
- Machermo to Gokyo
- Mackenzie Basin Forest Service Road (FSR)
- Madame Sherri Forest Loop
- Mad Hatter Ride
- Mad Man's
- Madonna del Balmone
- Madonna di Besta
- Madre Natura
- Madusa
- Mad Women's
- Mag 3 Shuttle
- Magic Forest -> Old 9 Line -> Mane Lane
- Magic Line
- Magic Valley - Kaiblingloch - Dürrenbachtal
- Magnificent 7
- Mahalo to Dry Creek
- Mahaulepu Heritage Trail: Shipwreck Beach to Punahoa Point
- Mailbox Peak Trail
- Maili Khokh (4600 m), via Spartak (4517 m)
- Main Buttermilk Uphill
- Main Face
- Main Goat Chute
- Mainline
- Main Line
- Main Line
- Maison Méane to Maljasset
- Major Tom
- Major Tom Approach
- Makalawena Beach
- Makalu BC to Lukla
- Makapu'u Point Lighthouse
- Makiki Valley Loop
- Makwa -> Hatchery Lollipop
- Makwa -> Hatchery Lollipop
- Malad Gorge
- Malgrubenspitze Nord-west
- Malham Cove, Gordale Scar and Janet's Foss
- Malham Discoveries
- Maligne Canyon Upper Loop
- Maligne Lake: Fisherman's Bay to Coronet Creek
- Maljasset to Aiguille
- Mallory
- Malpais Nature Trail
- Mama Bear
- Mammoth Crest
- Mammoth Crest Loop
- Mammoth Glades
- Mammoth Mountain Area- Mt Morrison East Face
- Mammoth Mountain Hole in the Wall
- Mammoth Mountain Trail
- Mammoth Mountain Via Dragon's Back
- Mammoth Rock -> Panorama Lollipop
- Mammoth Rock -> Panorama Lollipop
- Mam na Gualainn Circuit
- Man Boobs -> Leave of Absence -> Rollercoaster
- Manda II East Couloir Attempt
- Manie Loop
- Manlitzkogel
- Manoa Falls
- Mantagna, Carnale, Davaglione
- Mantova Couloir
- Many Pools
- Manzanilla's line
- Manzanita
- Maple Connector
- Maple Pass Loop
- Maple Ridge - Sunset Ridge Loop
- Maple Sally -> Brown Mountain Beach Gravel Loop
- Maple Sally -> Brown Mountain Beach Gravel Loop
- Marble Canyon
- Marble Mountain A
- Marble Mountain from Music Pass
- Marble Mountain from Music Pass
- Marbree Couloir
- Marbrées Direct
- Marcheuson's between slope line
- Marchkopf Northwest