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- Sachenia: a tiny state close to the Alps in the movie Herz ohne Krone.
- Samavia: Eastern European kingdom in Frances Hodgson Burnett's The Lost Prince.
- San Esperito: an island country somewhere in the Central America, in the 2006 video game Just Cause.
- Saroczia: Eastern European country which the United States invades, which serves as the terrorist basis in the video game Winback.
- Sauville: small kingdom between France, Switzerland and Italy from anime series Gosick. It consists of parts of the real Italian provinces: Aosta Valley, Liguria, Piedmont.
- Sciriel: Natalie is heiress to the throne in Roland Pertwee's late (1927) Ruritanian romance set just before and after World War I.
- Seravno: a Balkan country from the TV Series Mission Impossible.
- Servia: appeared in Bessie Marchant's A Princess of Servia (c. 1925).
- Skandistan: Islamic state comprising what was formerly Scandinavia. From the alternate history book The Years of Rice and Salt by Kim Stanley Robinson.
- Slavo-Lydia: Balkan country in the novels of Angela Thirkell; has a long-standing enmity with neighbouring Mixo-Lydia.
- Slavosk: a country in Eastern Europe from the TV series Danger Man. Drake must travel to Slavosk to rescue the supposed sister of a famous professor from this country.
- Slovetzia: a tiny country in Eastern Europe in the movie The Beautician and the Beast. Slovetzia is located between Romania, Ukraine and Hungary; situated roughly in Trans-Carpathia, a real region in the Ukraine. The republic is portrayed as a post-communist Eastern European dictatorship.
- Island of Sodor: between England and the Isle of Man, the setting for the Reverend Awdry's Thomas the Tank Engine railway network managed by Sir Topham Hatt.
- Soviet Unterzoegersdorf: the "last existing appanage republic of the USSR", a fake country created by monochrom for theatre performances and computer games.
- St Gregory: A British Crown dependency in the Channel Islands, featured in the ITV series Island at War. Based upon Jersey and Guernsey.
- Svardia: a tiny European republic located in the Balkens from the Mission: Impossible episode "The Train".
- Syldavia: Balkan monarchy featured in four stories of The Adventures of Tintin, neighbouring Borduria.
- Sylvania: From the Marx Brothers' movie Duck Soup. It was the country attacked by Freedonia.
- Symkaria: a small Eastern European country from Marvel Comics, the homeland of renowned mercenary Silver Sable.
Read more about this topic: Fictional European Countries