| 1914-18 Collection | First World War |
| Anglo German Collection | Translations into German and English |
| Bentham Book Collection | Books and pamphlets by, about and owned by Jeremy Bentham |
| Castiglione Collection | Editions of Castiglione's Il libro del cortegiano |
| Chambers Book Collection | English language, English literature, Scandinavian studies |
| College Collection | History of UCL |
| Dante Collection | Works by and about Dante |
| Euclid Collection | Editions of works by Euclid |
| Flaxman Book Collection | Books illustrated by John Flaxman |
| Fleming Book Collection | Electrical engineering and telegraphy |
| Folklore Society Collection | Folklore, magic, the occult, literature |
| Franciscan Society Collection | The Franciscan order, St. Francis of Assisi |
| Gaelic Society Collection | History of Scotland, Gaelic literature, Scottish literature |
| Galton Laboratory Book Collection | Statistics, genetics, eugenics |
| General Rare Book Collection | All disciplines are represented in this collection |
| Graves Library | History of mathematics |
| Hebrew and Jewish Collections | Anglo-Jewish relations, history, theology, Hebrew language, Yiddish language, Jewish literature |
| Hertfordshire Natural History Society Library | Natural History, botany |
| History of Science Sources | Chemistry, physics, mineralogy, astronomy, mathematics |
| Huguenot Library | Huguenots, Protestantism, immigration |
| Hume Tracts | Politics, economics, religion, education, social reform |
| Incunabula | Natural history, Euclid, Dante, theology, astronomy, classics, philosophy |
| James Joyce Book Collection | Books by and about James Joyce |
| Johnston Lavis Collection | Natural history, geology, vulcanology |
| Lansdowne and Halifax Tracts | British History, English Civil War, politics, economics |
| Laurence Housman Collection | Literature, women's suffrage movement, social reform |
| London History Collection | History of London |
| London Mathematical Society Rare Books | History of mathematics |
| Malacological Society Library | Malacology |
| Ogden Library | Language, communication, semantics, cryptography, translation, literature |
| Olden Collection | German political and economic history, German Empire, First World War, Second World War |
| Orwell Book Collection | Literature, translations, journalism |
| Rare English Dictionaries and Linguistics Collection | Language, grammar, orthography, translation |
| Rare Periodicals | Science, arts |
| Ray Society Collection | British flora and fauna, natural history |
| RNID Rare Printed Collection | Hearing loss, deafness and deaf people |
| Rotton Library | Religion, literature, language, travel writing, British and European history and politics |
| Sir Arthur Smith Woodward Collection | Palaeontology, geology |
| Sir Walter Scott Collection | Works by and about Sir Walter Scott |
| Small Press Collections | Independent publishing, experimental poetry and prose, little magazines, graphic design, alternative culture |
| Strong Room B, C, and E Rare Books | Books on all subjects printed before 1640 |
| Whitley Stokes Library | Celtic studies, folklore, folk literature, oriental religions |
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