All Boating Charters
- Messiah Cruise – Five East island Tours
- Messinia Trips
- Mexico Travel Adventure - Black Fin Boat
- Mexico Travel Adventure: Kalal Panga Boat
- Mexico Whale Shark – Capitan Tony
- Mexidivers
- Mi Sofi Tours – Cabo San Lucas
- Mia Vibes Charters
- Miami Beach Catamarans, LLC
- Miami Boat Tour, Raccoon Island, Sandbar
- Michael LR Jackson Tours & Travel
- Michael LR Jackson Tours & Travel
- Michelle Fishing Charters
- Michigan Charters
- Mid Coast Outfitters POC
- Middle Bay Fishing Charters
- Midnight Fleet – Midnight Star
- Mighty Heron Charters
- Mike Harter LLC
- Mike's Watersports
- Miles Escape Charters
- Miller Cruises Pensacola
- Miller Time Tours
- Milos VIP Services
- Mimosa Jamaica Yacht Charter - 55ft Mimosa
- Mina Boat Tours
- Mini Salt Maine
- Mirabello Boats - Apollon
- Mirabello Boats - Ares
- Mirabello Boats - Athena
- Mirabello Boats - Hera
- Mirabello Boats – Archangel Michael
- Mirabello Boats – Ermis
- Mirabello Boats – Eros
- Mirabello Boats – Ifestos
- Mirabello Boats – Poseidon
- Mirabello Boats – Zeus
- Mirisola Fishing Charters
- Mirissa Water Sports
- Mirse Azul
- Misraab by Merenga
- Miss B Haven
- Miss Emily Charters
- Miss Oregon Inlet II
- MissBhaven
- Missphitty Charters
- Mitchell Y Tapia SA De CV – Beluga's
- Mitchell Y Tapia SA De CV – Mariah
- Mito – Escape on the Ionian Sea
- Mizu Fishing Lanzarote
- Moana
- Mod Squad Charters
- Mollys Boats
- Moloko Charter
- Mona Lisa Cruises Bermuda
- Monarca Nautica
- Mongibello
- Montauk Charterboat CUJO
- Montenegrina Boat
- Montenegro Sailing Kotor
- Montenegro Submarine & Kotor Speed Boat Tours
- Montenegro Waves
- MontenegroGlobe Tours
- Monty Charter Experience
- Moorea Sunrise Fishing
- Moover Fishing Adventures
- Moreplovac
- Morris Island Tours
- Morska Vila II
- Mosselbay Ggroup Boat Trips
- Mother Ocean Charters – Adventures Your Way
- Motor Boat Rocco
- Motor Yacht Naïades
- Mow Fish Charter
- Mr Pelicano Private Boat Tour
- Mr. Bombastic Yacht Rentals
- Mr. Nobody Snorkeling and Activities
- Mr. Sea 50ft Flybridge w/Paddle & Inflatables
- Mr. Yacht Mexico – Isla Mujeres Charter
- Mr. Yacht Mexico – Reef Snorkel & El Cielo
- Mtwapacreek Boat and Yacht Charters
- Muddy Creek Adventures
- Mulan Charters
- Murrells Inlet Sunset Cruises
- Muscles Magoo – Hey Pal Fishing LLC
- Mutton Tours & Water Sports
- My Bahamas Boat Tours & Excursions
- My Charter Rapallo – Antares Elba 78
- My Charter Rapallo – Antares Lipari
- My Dolce Vita Cruise
- My Dream Private Tour
- My Island
- My Islands Adventure
- My Local Sea. Zth
- My Yachtweek SL – My One
- Mycrew Nautic Activities – Beneteau Oceanis
- Mycrew Nautic Activities – Beneteau ST 48
- Mycrew Nautic Activities – Jeanneau DB 43
- Mycrew Nautic Activities – Ribera Yacht 980
- Mykonian Spirit Cruises