| Short Name | City | Other Relevant Names | Official Name | RISM Sigla |
|---|---|---|---|---|
| BU Sevilla | Sevilla | Biblioteca de Universidad de Sevilla | E-Sbu | |
| Bibl. Com. Siena | Siena | Biblioteca Comunale degli Intronati | I-Sc | |
| Chapitre Sion | Sion | Sitten | Archives du Chapitre | CH-Sk |
| LB Speyer | Speyer | Landesbibliothekszentrum Rheinland-Pfalz | D-SPlb | |
| KB Stockholm | Stockholm | Kungliga Biblioteket | S-Sk | |
| Riksark. Stockholm | Stockholm | Riksarkivet Skoklostersamlingen | S-Sr | |
| LB Stuttgart | Stuttgart | Württembergische Landesbibliothek | D-Sl | |
| Magistraat Tallinn | Tallinn | Tallinna Magistraat | ||
| Bibl. Públ. Tarragona | Tarragona | Biblioteca Pública del Estado en Tarragona | E-TAp | |
| UB Tilburg | Tilburg | Universiteitsbibliotheek | ||
| Bibl. Cap. Toledo | Toledo | Biblioteca Capitular | E-Tc | |
| Bibl. Castilla Toledo | Toledo | Biblioteca de Castilla-La Mancha | E-Tp | |
| Univ. Toronto | Toronto, ON | University of Toronto Library | CDN-Ttfl | |
| BM Toulouse | Toulouse | Bibliothèque municipale, Bibliothèque d'Etude et du Patrimoine | F-TLm | |
| BM Tours | Tours | Bibliothèque municipale | F-TOm | |
| Bistumsarch. Trier | Trier | Bistumsarchiv | D-TRb | |
| SB Trier | Trier | Stadtbibliothek Weberbach | D-TRs | |
| Lit. Arch. Trnava | Trnava | Nagyszombat | Literárny Archív Spolku Svätého Vojtecha | SK-TRs |
| BM Troyes | Troyes | Bibliothèque municipale | F-T | |
| Bibl. Cap. Udine | Udine | Biblioteca Capitolare | I-UD | |
| UB Uppsala | Uppsala | Universitetsbiblioteket | S-Uu | |
| UB Utrecht | Utrecht | Universiteitsbibliotheek | NL-Uu | |
| Carreres Valencia | València | Valencia | Biblioteca Carreres | |
| BU Valencia | València | Valencia | Biblioteca de Universitat de València | E-VAu |
| Bibl. Valencia | València | Valencia | Biblioteca Valenciana Nicolau Primitiu | E-VAbv |
| BM Vannes | Vannes | Bibliothèque municipale | F-VA | |
| BAV | Vatican City | Città del Vaticano, Vatikánváros | Biblioteca Apostolica Vaticana | V-CVbav |
| BM Vendôme | Vendôme | Bibliothèques de la Communauté du Pays de Vendôme | F-VENbm | |
| Sem. Arciv. Venegono Inferiore | Venegono Inferiore | Biblioteca del Seminario arcivescovile di Milano | I-VNGs | |
| Bibl. Arch. Cap. Vercelli | Vercelli | Archivio e Biblioteca Capitolare | I-VCd | |
| BM Verdun | Verdun | Bibliothèque municipale | F-VN | |
| Bibl. Cap. Verona | Verona | Biblioteca Capitolare | I-VEcap | |
| Érseki Veszprém | Veszprém | Érseki Könyvtár | H-VE | |
| Arx. Cap. Vic | Vic | Vich | Arxiu Capitular | |
| Arx. Bibl. Ep. Vic | Vic | Vich | Arxiu i Biblioteca Episcopal | E-VI |
| Sabio Vitoria-Gasteiz | Vitoria-Gasteiz | Fundacion Sancho el Sabio | ||
| OCist Vyšší Brod | Vyšší Brod | Knihovna cisterciáckého kláštera | CZ-VB | |
| BN Warszawa | Warszawa | Varsó | Biblioteka Narodowa | PL-Wn |
| ÖNB Wien | Wien | Vienna, Bécs | Österreichische Nationalbibliothek | A-Wn |
| UB Wien | Wien | Vienna, Bécs | Universitätsbibliothek | A-Wu |
| HAB Wolfenbüttel | Wolfenbüttel | Herzog August Bibliothek | D-W | |
| Landesarch. Wolfenbüttel | Wolfenbüttel | Landes-Hauptarchiv | D-Wa | |
| Ossolineum Wrocław | Wrocław | Breslau, Boroszló | Zakład Narodowy im. Ossolińskich | PL-WRzno |
| UB Würzburg | Würzburg | Universitätsbibliothek | D-WÜu | |
| Knj. Metrop. Zagreb | Zagreb | Zágráb | Knjižnica Metropolitana | HR-Zmk |
| NSK Zagreb | Zagreb | Zágráb | Nacionalna i sveučilišna knjižnica | HR-Zu |
| Bibl. Prov. Zaragoza | Zaragoza | Biblioteca de la Diputación Provincial de Zaragoza | ||
| OCist Zwettl | Zwettl | Stiftsbibliothek | A-Z |