- S, J.
- Saarinen, Eero
- Sadler II, William
- Salkeld, Cecil Ffrench
- Sargent, Louis
- Sarte, Maxime Real del
- Savage, Jim
- Savini, Augusto
- Sawyer, Richard
- Scanlon, James
- Scharf, William
- Schneider, Cristallerie
- Schonhauser, Franz H.
- School, Irish
- Schulman, Richard L.
- Schurmann, Killian
- Schwatschke, John
- SCIOLARI, GAETANO
- Scott, Anthony
- Scott, James
- Scott, John
- Scott, Patrick
- Scott, William
- Scully, Sean
- Secto
- Senior, William Shayer
- Set, A 1990 ECU
- Sets, Irish Stamp Year
- Sevilla, Ferran Garcia
- Sexton, Leonard
- Seymour, Dermot
- Shanahan, Sean
- Sharkey, Kevin
- Sharkey, Sinead
- Shaw, Denis Orme
- Shaw, Dennis Orme
- Shaw, George Bernard
- Shaw, H G
- Shawcross, Neil
- Shayer, William Joseph
- Sheil, Sonia
- Shelbourne, Anita
- Sheridan, Noel
- Sheridan, Vincent
- Shevlin, Linda
- Shiel, Leonard
- Shiel, Sonia
- Shiels, John
- Shinnors, John
- Short, Constance
- Shouha, Manar Al
- SIGNORETTO, SILVANO
- Simmonds-Gooding, Maria
- Simmongs-Gooding, Maria
- Skelton, John
- Skinner, Christopher
- Sleator, James Sinton
- Slein, Daryl
- Slevin, J.
- Sloan, Joseph
- Sluis, Piet
- Smith, Blaise
- Smith, Carlton Alfred
- SMITH, CATELLANI &
- Smith, Daniel Shaw
- Smith, Dorothy
- Smith, Fiona
- SMITH, GEORGE
- Smith, John Noel
- Smith, Paki
- Smith, Richard
- Smth, Blaise
- Smyth, Michael
- Smyth, Norman
- SOGNOT, LOUIS
- Solomon, Isaac
- Somer, C.
- Son, Frederick Mann &
- SON,, CARL HANSEN &
- Songs, Great Irish
- SONS, BERNHARD PEDERSON &
- Soulages, Pierre
- Souter, Camille
- Souter, Michelle
- Souter-Robinson, Joan
- Spencer, William G.
- Spoon, An Irish Silver Serving
- Spoons, A Set of 12 Feather Edge Dessert
- Spring, Alfons
- Stackpoole, Anita
- Stafford, Ebby
- Stangle, Hans
- Stanley, Jacqueline
- Staples, Robert Ponsonby
- Stapleton, Rose
- Starck, Philippe
- Staunton, Tracy
- Stephens, James
- Stevenson, Patric
- Stevenson, Wendy
- Steyn, Stella
- Stilnovo
- STILNOVO,
- Stockum, Hilda Van
- Stokes, Margaret
- Strahan, Robert
- Street, Evelyn
- Stuart, Imogen RHA, 1927-2024
- Style, Jorge Zalszupin
- Style, Willy Rizzo
- Sunderlundh, Michael
- Sutherland, Graham
- Sutton, Ivan
- Swan, Charlotte
- Swanzy, Mary
- Sweeney, Caroline
- Sweeney, Ger
- Sweet, Lindsey
- Swift, Patrick
- Swimberghe, Gilbert
- Sykes, Sasha
- Synge, John Millington
- Szedleczky, Rudolf
