| Safety stock | Reserve stock below which levels should not fall. |
| Salvage material | Unused material with market value. |
| Scrap material | Defective material with no market value. |
| Screening charge | Surcharge for airport terminal screening. |
| Sea Waybill | Transport document for sea shipments. |
| Security Filing | Requirement to submit shipment details electronically. |
| Separable cost | Cost directly assignable to a business segment. |
| Service | Defined, regular pattern of calls for cargo pickup. |
| Service Contract | Agreement to optimize service flow in supply chains. |
| Ship agent | Authorized individual performing actions on behalf of another. |
| Shipbroker | Intermediary facilitating transactions between parties. |
| Shipment | Load of goods sent by various modes. |
| Shipment Point | Location from where goods depart. |
| Shipper's agent | Firm matching small shipments to optimize transport. |
| Shipper’s Letter Of Instruction (SLI) | Instructions for a freight forwarder detailing shipment specifics. |
| Shipping Quote | Document detailing shipment legs and associated surcharges. |
| Shipping Types | Different levels of service used for order fulfillment. |
| Special Customs Invoice | Customs invoice required in addition to a standard one. |
| Spot Voyage | Charter for a specific voyage or cargo movement. |
| Stevedore | Organization specializing in ship loading and unloading. |
| Storage | Cost of storing cargo off-site. |
| Stowage | Placing goods to level or stuff under-deck voids. |
| Stripping | Breaking down a container. |
| Surcharge | Add-on charge to applicable charges. |
