- seaward
- seaworthy
- second deck
- secondary collision
- secondary damper
- secondary nozzle
- section block
- secure
- self-propelled
- secondary road
- secondary suspension
- section
- sectional drawing
- securing track
- self-propelling
- semicontainer ship
- semaphore
- semaphoric program
- semidiurnal tide
- serial rudders
- seize
- seizure
- self-draining
- semaphor arm
- senhouse slip
- sennet
- Sensitivity analysis
- service
- service application
- service brake
- service braking
- service ceiling
- service speed
- service trolley
- service vehicle
- service volume
- servo control
- set sail
- set-off
- shallows
- servo unit
- set in
- sextant altitude
- sheer forward
- sheet
- shell
- shelter
- shift
- shifting
- ship
- ship handling
- shipbuilding
- shear resistance
- sheathed deck
- sheer aft
- sheer off
- shim
- shimmy damper
- ship breaking
- ship canal
- ship girder
- ship loading
- ship rolling
- ship station
- shipbuilder
- shipmaster
- shipping company
- shipping documents
- shipping order
- shipping trade
- shipping weight
- shipshipment
- short blast
- shunter
- shunting chart
- shunting foreman
- side collision
- side corridor
- side girder
- side thruster
- sidebearer pad
- signal box
- signal bracket
- signal lever
- signal man
- signal mast
- signal operator
- signal spacing
- signaling distance
- signalling cable
- simple curve
- simultaneous system
- single journey
- single mode
- single rotor
- sheepshank
- sheer
- sheer drawing
- sheer line
- sheer plan