All Boating Charters
- SiP Travel – Blue Cave Adventure
- SiP Travel – Boka Bay Tour
- Sicily Fishing Charter
- Sicily Yachting Club
- Side Quest Charters
- Sidekick Charters
- Sierra Surf House
- Siesta Cruise Boat Tours
- Siesta Key Snorkel
- Sightseeing, Booze Cruise
- Sightseeing,Booze,Sunset and Lake Boca Cruise
- Silver Thatch Watersports – Diver
- Silver Thatch Watersports – MB
- Silver Thatch Watersports – Silver Thatch II
- Silver Tuna Sport Fishing
- Simon Says Charters
- Sin Priza – Snorkeling Tour
- Singing Reel Charters
- Sip N Sea Charters – Fun In The Sun!
- Sip and Sea Charleston
- Sip and Sea Charleston
- Siren – 60' Iconic Luxury Yacht
- Sirena Moris
- Sirena – Splav & Brod
- Sirigos Yachting
- Sisi Boating Experiences
- Six Shooter Charters
- Skadar Lake – Boat Cruise
- Skarpina Budva
- Skinny Dipn Charters
- Skipper Allan Sea Excursions
- Skipper Charters
- Skipperdan Boat Ltd
- Skirtchaser Charters
- Sky Walker Yachts – 96 FT Caliente
- Sky Walker Yachts – C-62
- Sky Walker Yachts – S-60 Infinity
- Sky Walker Yachts – X-63 Amie
- Sky Walker Yachts – С-52 Sky Walker
- Skylar Blue Sportfishing
- Skyway Fishing Tours
- SlackTyde Charters
- Slick Calm Charters
- Smile Boats – Kattum K30
- Smokin Hooks
- Smooth Sailing Of Miami
- Snap Decision Charters
- Snorkel/Shelling Eco Tour
- Snorkeling Trip With Tamarindo Surf & Tours
- Snorkeling With Sea Turtles
- SoFlo Charters
- SoMax Fishing
- Solara Maldives
- SoleMare LLC
- Soleil Sport Fishing – Boat Tours
- Solevela Yacht Charter
- Solmar Aegina Villa & Yacht
- Solo Good
- Solé Watersports – Private Excursions
- Something Fishy Charters
- Sorrento Sea Service – Siren
- Sorta Salty Charters
- Soundside Tours
- South Cruise Adventures
- South Flow Charters
- South Jersey Outfitters
- South Padre Fishing Guide
- Southern Angler Fishing Charters
- Southern Angler Fishing Charters
- Southern Angler Fishing Charters
- Southern Angler Fishing Charters
- Southern Belle Charters
- Southern California Adventure, Inc
- Southern Slots Charter Co
- Southern Sons Charters
- Southern Sun Guides
- Southern Tauk Charters
- Southern Voyage Eco/Sunset Tours
- Southwest Sportfishing
- Sozopol Boat Tours
- SpaceX Bay Tour - South Padre Island TX
- Spanish Wells Island Charters
- Spark Waves Group – Speed Boat "Selena"
- Sparus Boats - Luxury Motor Yacht Colnago 38
- Sparus Boats - Luxury Motor Yacht Colnago 45
- Sparus Boats - Rib Boat Marlin
- Sparviere Boat Tours – Relaxing Day In Capri
- Speartime Luxury Charters Barbados
- Speed Boat Albatross
- Speed Boat adventures
- Speedboat Maria
- Speedboat Phi Phi and Maya Bay Tour
- Speedboat Prasitporn Pattaya
- Speedboat Tours Tivat
- Speranza 40 – Island Hopping Tour
- Sphynx BCN
- Spindrift Charters – Grand Cayman
- Spinnaker Sailing SF
- Spirit Of La Paz – Private Chaters
- Split Sea Tours