dock - drag
- dock-worker
- docking
- docklines
- dodger
- dog watch
- dog's shank
- doghouse
- DOM
- dope test
- doping
- Dorade ventilators
- dory
- double block
- double bottom
- double Carrick Bend
- double concave hull shape
- double ended
- double lenght of the boat
- double length of the boat
- double lifelines with gates
- double Matthew Walker
- double overhand knot
- double sheave block
- double sheetbend
- double Spanish burton
- double spreader rig
- double tacking
- double wire seizing
- double-bottom-tank
- douse a sail
- downflooding
- downflooding angle
- downhaul
- downwind
- downwind directional controllability
- downwind start
