Biokleen — Blackbirdboats
- Biokleen
- Birch Bark Canoe
- Bird Free Boats, Keep Pest Birds off Your Boat
- Bird-B-Gone, Inc.
- Bird-Buster
- Birdoff, keeping birds off your boat
- Birdsall Marine Design
- Biscayne Lady Yacht Charters
- Bisexual Couples,Bisexual Women and Bisexual Men Bi Dating Site
- BiT Marine Software | Boat Dealer Software | Mari
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- Black Bear Boat Propellers
- Black Business
- Black Cat Scenic Wildlife Cruises
- Black Dog Kayaks
- Black Dog Propellers
- Black Sea Yachtsmen's Association
- Black Whale Cruises
- Blackadar Marine Insurance
- Blackbeard's Cruises
- Blackbird Industries
- Blackbirdboats