• S
• Sable
• Sabre
• Sacred
• Sacred Heart
• Sacrifice
• Safety Orange
• Sailor
• Saint (see also St.)
• Salem
• Salesian
• Salisbury
• Saltire
• Samoa ⚐
• San (see also St.)
• San Andres ⚐
• Sanctification
• Sanctuary
• Santa Claus
• Santa Cruz de Mompox ⚐
• Santiago
• Santo Antônio do Pinhal ⚐
• Santo Cristo ⚐
• São Paulo ⚐
• Saragossa
• Sarcellée (Sarcelly)
• Sardinia ⚐
• Sash
• Satanic
• Satan's Pitchfork
• Savoy ⚐
• Saxon
• SBC
• Scallop
• Scandinavian
• Sceptre
• Schwarzenau Brethren +
• Schwyz ⚐
• Scientology
• Scimitar
• Scorzelli
• Scotland ⚐
• Scottish ⚐
• Scourge
• SD
• Sea shell
• Seaman (Seafarer)
• Search
• Seasons
• Secession
• Seeing Eye
• Seiyaku
• Seraphim
• Serbia
• Serbian Orthodox Church +
• Serenity
• Serpentine / Serpent
• Seven Loaves and a Few Fishes
• Seventh Day Adventist +
• Shamrock
• Shell
• Shepherd
• Shetland ⚐
• Shieldknot
• Shinto
• Shrouded
• Shuriken
• Sickness
• Sideways ⚐
• Sigla
• Sign of the +
• Silver
• Silver Fern
• Simalungun Protestant Christian Church +
• Simbu Province ⚐
• Simplex
• Sinner
• Siroun
• Sisters of Mercy +
• Sitges ⚐
• Six-armed (iota-chi)
• Skåneland ⚐
• Skeptic
• Skopje
• Skull and crossbones
• Slanting
• Slavic (Slavonic)
• Sligo ⚐
• Slovak Greek Catholic Church +
• Slovakia ⚐
• Slupca ⚐
• Snake
• Snowflake
• Sobrescobio ⚐
• Society of St. Pius X +
• Solar
• Soldier
• Solomon
• Solomon's Knot
• Sotaveteraaniliitto
• South Atlantic Islands ⚐
• South Australia ⚐
• South Georgia ⚐
• South Sandwich Islands ⚐
• South Uist ⚐
• Southern
• Southern Baptist Convention +
• Spain
• Spanish
• Sparkling
• Spear
• Spider
• Spiky
• Spinning
• Spiral
• Spiritual
• Splayed
• Splendour
• Split
• Sponge
• Sprite
• Square
• St. Achilleus
• St. Albans
• St. Aldhelm
• St. Andrew
• St. Andrew's Ambulance
• St. Anthony
• St. Basil
• St. Benedict
• St. Birgitta
• St. Brendan
• St. Bride
• St. Brighid (Brigid, Bridget, Bridgit, Brigit)
• St. Catherine
• St. Ceadda
• St. Chad
• St. Clement
• St. Columba
• St. Cuthbert
• St. Damian (San Damiano)
• St. David
• St. Dimas
• St. Dominic
• St. Florian
• St. Francis
• St. George
• St. Hannes
• St. Hans
• St. Helena ⚐
• St. Iarlaithe
• St. Ignatius
• St. James
• St. Jarlath
• St. Joan of Arc
• St. John
• St. John Ambulance
• St. Julian
• St. Luke
• Sts. Maries de la Mer
• St. Maron
• St. Martin
• St. Nicholas
• St. Nino
• St. Olga
• St. Patrick
• St. Paul
• St. Peter
• St. Petroc ⚐
• St. Philip
• St. Pierre & Miquelon ⚐
• St. Piran ⚐
• St. Quentin
• St. Stephen
• St. Thomas
• St. Valentine
• St. Vincent
• St. Volodymyr
• Staff
• Stained Glass
• Stairs
• Stake
• Stamford
• Stanhope
• Star
• Star of David
• Star of Life
• Starcevo ⚐
• Stari Grad ⚐
• Starry
• Stars and Stripes
• Stations
• Staurogram
• Stauros
• Stavropol Krai ⚐
• Stellated
• Stephen
• Stepped
• Stereoscopic (sic)
• Stipe
• Stone
• Stony Stratford
• Straw
• Strijen ⚐
• Stronsay
• Stump
• Suavastika
• Succubus
• Suffering
• Sulfur
• Sumy Oblast ⚐
• Sun
• Sun Myung Moon
• Sunburst
• Sunken
• Sunrise
• Suomen Sotaveteraaniliitto
• Suppedaneum
• Surdulica ⚐
• Swan
• Swastika
• Sweden
• Swiss
• Switzerland
• Sword (single)
• Swords (double)
• Symboless
• Syriac Orthodox Church (incl. Jacobite) +
• Syrian
• Syro-Malabar Catholic Church (Nasrani) +
• Syro-Malankara Catholic Church +

⚐ denotes cross on the flag of a nation or region
+ denotes cross on the emblem of a church or denomination

There are countless more. We are continually updating information on all these crosses and adding more as they become known to us.