All Boating Charters
- Maria del Puerto – Maui Ocean
- Maria del Puerto – Moana
- Maria del Puerto – Sirenas
- Mariaboat
- Marieta Sport Fishing
- Marina Boat Charters
- Marina Boat Charters – Sports RIB
- Marina del Rey 39 Passenger Party Cruiser
- Marinas
- Marine Go
- Mariny Charter Srl
- Mario Rent DOO – Hvar Yachting
- Marionrent DOO
- Maritime Commercial Charters
- Maritime Operations LLC
- Maritimo Yachts
- Mark Guillot’s Outdoor Adventures
- Markuboattours
- Marlin My Darlin
- Marosca Boat
- Marrajo Fishing Charter
- Martha’s Vineyard Charter Company
- Maréna Boat Tours
- Mas Picudos Charters
- Masheen Charters
- Master Bite
- Master Charters
- Mathis Ocean Adventures
- Mautiyak – 32' Boat
- Mautiyak – Trimaran Kayak
- Maxie Sailing Curacao – Private Boat Tours
- Mayara Boating
- Mayhem Sportfishing
- Mclir Srl
- Medulin Excursions – MB Sandra
- Megabite Costa Rica Sport Fishing
- Megacatch – Cris Makei
- Megacatch – Don Bosco
- Megafishing Beach
- Mera Mare Boat Tours
- Mera Mare Boat Tours
- Merluzapr
- Messiah Charter Srl
- Messiah Cruise
- Messiah Cruise – Five East island Tours
- Mexico Whaleshark - Capitan Tony
- Mexidivers
- Mi Sofi Tours – Cabo San Lucas
- Mia Vibes Charters
- Miami Beach Catamarans, LLC
- Miami Boat Tour, Raccoon Island, Sandbar
- Miami Mistress – Sea Ray 52'
- Michael LR Jackson Tours & Travel
- Michael LR Jackson Tours & Travel
- Michelle Fishing Charters
- Michigan Charters
- 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
- Millionaries Row Boat Tour
- Milos VIP Services
- Mimosa Jamaica Yacht Charter - 55ft Mimosa
- Mina Boat Tours
- 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
- 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
- Mizu Fishing Lanzarote
- Moana
- Mobile Bay Charters
- Mod Squad Charters
- Mollys Boats
- Moloko Charter
- Mona Lisa Cruises Bermuda
- Monarca Nautica
- Mongibello
- Montauk Charterboat CUJO
- Montenegrina Boat
- Montenegro Sailing Kotor