All Boating Charters
- Crystal Flats Guide Service
- Custom Cat Charters
- Custom Charters
- CycladesAzulSailing
- D.C. Outdoor Adventures
- D.I. Reef Monster Sightseeing Charters
- DC Marine Charters and Tours
- DEEP 07 – Fishing & Boat Charters
- DEEP 07 – Fishing & Boat Charters
- DENİZ CAN
- DIAMANTEDOURO
- DIAMANTEDOURO
- DIN Boat Marbella
- DIRTY DOLLY - Dolphin & Port Tours
- DSJ Fishing Charters
- DSquared Enterprises
- DUBROVNIK SAIL AWAY
- Da Island Link Escapes
- DaFishHunterCharters
- Dailey Charters
- Daily Boat And Fishing Charters
- Daily Rhodes Cruises
- Daisy – Glass Bottom Boat
- Damiano – Captain of Blue Escape
- Dan Nealy's Fishing Buddies
- Dana Wharf Whale Watching – Catamaran
- Dana Wharf Whale Watching – Hatteras
- Dancin Doc
- Dancing Queen Boat Charter
- Danger Charters
- David
- Davor Zambelli
- Day on the Bay Charters
- Day on the water
- Day with A Native Tour (custom adventures)
- Daytripper Marine Services
- De La Paz Boat Traveler
- Deboto Boats – Quicksilver 675
- Deboto Boats – Quicksilver 755 / Atlantic 750
- Deep Blue Charters
- Deep Color Excursions
- Deep Republic
- Deep Sea Fishing – Bénitier Island Tour
- Deep Sea Scuba
- Deep Sea Scuba and Snorkeling
- Deep blue PG
- Delphi Watersports – Private Boat Ride
- Delta Outfitters
- Delta of Tigre Boat Tour – Capt. Enrique
- Deluxe Private Boats
- Destin Dream Yacht
- Destin Private Tiki Lil Kahuna to Crab Island
- Destin Private Yacht
- Detroit River Tour
- Devotion boat tours – 5 Islands Boat Trip
- Dhermi Boat Tours
- Diamante Blu – Next 22
- Diamante Blu – Saver 750
- Diamond Head Cruises – Snorkel & Whale Watch
- Diamond Jig Charters LLC
- Diamond Sailing Service
- Diamond in the Rough Charters
- Dimokriteio Cruises
- Discover Parguera Boat Charter
- Discover Plavnik On A Pirate Ship
- Discover St.Lucia Tours
- Discover Tamarindo – Jungle Boat Tour
- Discovery Agri Tours
- Disney the VIP Yacht
- Dispatch Saltwater Tours
- Ditch Hag Sportfishing Charters
- Divergent Charters
- Diverso Cruiser VIP
- Divine Boats
- Dockside Charters and Watersports
- Doha, Cruise and Swim Journey
- Dolce Vita Charters
- Dolphin & Donuts Cruise
- Dolphin & Morris Island Boat Tours
- Dolphin Connection Ingleside
- Dolphin Discoveries 1 – Hilton Head
- Dolphin Discoveries 2 – Hilton Head
- Dolphin Discoveries 3 – Hilton Head
- Dolphin Escape Charters
- Dolphin Landings Charter Boat – Fantasea
- Dolphin Landings Charter Boats – Phoenix
- Dolphin Landings Charter Boats –Island Hopper
- Dolphin Landings Charter Sailing Yacht –Magic
- Dolphin Safari Charters – Vitamin Sea
- Dolphin Tours Cocoa Beach
- Dolphin Watching with a Marine Biologist
- Dolphin,Manatee Tours. DolfunTours LLC
- Dolphins Marbella
- Domestic Six Pack
- Dominican Attitude Excursions
- Domus Salerno Boat Experience
- Don't Worry, Leopard 45 Sail Catamaran
- Dona Nina Fishing Tour
- Dorothy Charters
- Dorothy Marie Tours