All Fishing Charters
- Nuevo Vallarta Fishing – Totoaba
- Nuevo Vallarta Fishing – Viamar
- Nuevo Vallarta Sports Fishing
- Nugget Fishing Charters
- Nuj Kay - Kaan Kun Fishing
- Number 1 Boat Charters – Mozambique
- Number 1 Fishing Charters – Maputo
- Náutica Madrugada
- O Happy Day V
- O Sea D Charters – 2021 Cape Horn 31'
- O Sea D Charters –2015 Cape Horn 31
- O Sea D Charters –2017 Sea Hunt 27'
- O-Sea-D Sportfishing LLC
- OAPB Fishing Charters
- OB's Guide Service
- OBA Saltwater Charters
- OBT Charters
- OBX Fishing Co – Clam Chowder
- OBX Fishing Outfitters
- OBX Inshore Fishing - Chowan
- OBX Inshore Fishing Excursions
- ODF - Ocean Dive & Fishing LDA
- OMC Fishing Adventures
- ONE MORE Fishing Charters
- ONX Charters
- OV Luxury Charters
- Oahu Pelagic Sportfishing
- Oak Island Sport Fishing Charter
- Oak Island Sport Fishing – Ocean Isle Beach
- Oasis Alaska Charters – Boat 1
- Oasis Alaska Charters – Boat 2
- Obee Fishing Charters
- Obsession Charters, Inc
- Obsession Fishing
- Obsession Fishing Guide Service
- Obsession Fishing – Fall Salmon
- Obsession Fishing – Kokanee
- Obsession Fishing – Oregon Coast
- Obsession Fishing – Spring Chinook
- Obsession Fishing – Steelhead
- Obsession Fishing – Summer Chinook
- Obsession Fishing – Walleye
- Obsession Sportfishing
- Ocealics Fishing Trips
- Ocean Addict Hawaii LLC
- Ocean Adventurers Maldives
- Ocean Blue Kona
- Ocean Born Adventure Sport Fishing
- Ocean Breeze Charters 53 Ft. Vessel
- Ocean Catch
- Ocean City Girl - groups up to 16 people
- Ocean Cruise - Al Rubban
- Ocean Dream Charters – Wai Tadra
- Ocean Drive
- Ocean Explorer Fishing
- Ocean Fun & Fishing – Big Game Portugal
- Ocean Hunter Charters
- Ocean Life Fishing Charters
- Ocean Life Fishing Charters – Ocean Flair
- Ocean Obsession Guide Service
- Ocean Outlaw Fishing Charters
- Ocean Spirit Fishing Charters
- Ocean Strike Fishing
- Ocean Surf and Sport Fishing Charters
- Ocean Sweet Caroline
- Ocean Time
- Ocean Tribe
- Ocean Waves Yachts & Boat Rental
- Ocean Waves Yachts & Boat Rental 2
- Ocean and Island Tours Fiji
- Ocean4You Offshore Fishing Charters
- OceanBeast
- Oceana II Réunion Island
- Oceanic Journeys Yachts Rental
- Oceans West Adventures
- Oceans West Adventures
- Oceanside Charters
- Oceantur Azores Sportfishing – 42'
- Oceantur Azores Sportfishing – Rabão
- Ochlockonee Outfitters
- Ocho Rios Fishing Fun Adventure
- Odyssey Fishing Charters
- Off Course Charters
- Off Duty Again Charters
- Off Duty Charters
- Off Island Adventures – Nearshore/Inshore
- Off Island Adventures – Pamlico Adventure
- Off The Charts!
- Off The Clock Fishing Charters
- Off The Dock Charters
- Off The Dock Charters
- Off The Grid – OTG
- Off The Hook - Homestead
- Off The Hook Bass Fishing Charters
- Off The Hook Charters
- Off The Hook Charters ll
- Off The Hook Charters lll
- Off The Hook Charters – 29' SeaVee
- Off The Hook Charters – Capt. Cliff
- Off The Hook Charters – Captain Perry