M
- Marcos de Niza Trail
- Margam Park and Brombil Reservoir
- Margaroli Hut to Airolo
- Margschierf
- Maria Waldrast
- Marinelli Couloir from Dufourspitze (4634m)
- Mariokopfe-Langen.
- Mariposa Grove
- Marjorie Bowl
- Marlette Lake Trail
- Marley's Glade
- Marmotes Jumps
- Marmotte 17
- Marmottes
- Marmotte's line
- Marmottes Variant
- Maroon Peak: South Ridge
- Maroon Peak: South Ridge
- Marquise
- Marsalforn to Mgarr
- Marsalforn to Nadur via Ramla Bay and the Tal-Mixta Cave.
- Marsalforn to Ramla Bay and Xaghra.
- Marscholhorn (Piz Moesola, 2904 m)
- Marshall Pass Road
- Marsh Quarry
- Marstrand Island
- Marteau Sauvage
- Martigny-Combe à Chamonix 40km
- Martis Creek Trail
- Marufo Vega Trail
- Marufo Vega Trail
- Marulung to Gokyo via the Renjo La Pass
- Marvins
- Marvin's -> KGB -> Phil's Loop
- Marvin's -> KGB -> Phil's Loop
- Mary Jane Falls
- Mary Jane Uphill
- Maryland Heights and Stone Fort Loop
- Maryland Heights Loop
- Maryland Heights Out-and-Back
- Marymere Falls
- Mary Schäffer Loop
- Mary Schäffer Loop
- Mary's Nipple
- Mary's -> Steve's -> Wrangler's Loop
- Mary's -> Wrangler's Loop
- Mary's -> Wrangler's Loop
- Masada Snake Path
- M*A*S*H TV Set Hike
- Massa del Turlo
- Massanutten Mountain Trail
- Mastodon Peak Loop
- Matching Jersies
- Mathews' Traverse Rd
- Matier North West Face
- Matrei to Innsbruck via Maria Waldrast
- Matrimony
- Matterhorn, 4478m. Hörnli Ridge.
- Matterhorn East Face
- Matukituki Basin
- Maudekollen
- Maulerhubel
- Maungawhau - Mount Eden Summit
- Maxfield Approach
- Maxfield Basin
- Maxi Avalanche
- Max Patch
- Mayfield Lavender Farm and Oaks Park
- Mayflower Gulch
- M.B.C. to the Col des Montets
- McAfee Knob
- McCoy Flats Beginner Loop
- McCoy Flats Tech Ride
- McCullough Hills: 701 Loop
- McCullough Hills: 701 Loop
- McCullough Hills Loop
- McDougall Rim
- McDowell Competitive Track
- McDowell Mountain: Escondido Loop
- McDowell Mountain: Pemberton Loop