104 selected
- Not filled in
- Safety
- Sailing
- Sailing vessels
- Saints
- Salamanders
- Salvation Army
- Sanatoria
- Santa Claus
- Satellites
- Save
- Scent stamps
- Schools
- Science
- Science Fiction
- Scientists (Researchers)
- Scooters
- Scouting
- Scriptures
- Sculpture
- Sea mammals
- Seahorses
- Seals [animal], sea lions and walruses
- Seals [authentication]
- Seascapes
- Seasons
- Second World War
- SEPAC
- Sextants
- Sharks
- Sheep
- Shells
- Ship building
- Shipping
- Ships
- Shipwrecks
- Shooting sport
- Shops
- Shot-put
- Signs
- Silver objects
- Singers
- Skateboarding
- Ski jumping
- Skiing
- Skyscrapers
- Slalom
- Sledges
- Snails
- Snakes
- Snow
- Snowboarding
- Socialism
- Sociologists
- Solar eclipse
- Spaceflight
- Speedboats
- Spiders
- Sport diving
- Sport fishing
- Sports
- Spring
- Squash
- Squirrels
- St. Nicolas
- Stadiums
- Stage
- Stained-glass
- Stamp collectors
- Stamp Day
- Stamp on stamp (Postage stamps)
- Starfishes
- Stars
- Stations
- Statues
- Steam engines
- Steam traction
- Steamers
- Stone age
- Stones
- Storks
- Strips (Comic Books)
- Strongholds
- Stylized animals
- Stylized birds
- Stylized flowers
- Stylized plants
- Stylized trees
- Submarines
- Subways
- Summer
- Summer stamps
- Sun
- Sundials
- Sunflowers
- Surfing
- Surtax
- Swans
- Swimming
- Swimming pools
- Swines
- Swords
- Symbolism
- Synagogues
- Synchronized swimming