Outline of the Library of Congress Classification Scheme
| A| B | C | D | E | F | G | H | J | K | L | M | N | P | Q | R | S | T | U | V | Z |
| A | General Works |
| AC | Collections. Series. Collected Works |
| AE | Encyclopaedias (General) |
| AG | Dictionaries & Other General Reference Books |
| AI | Indexes (General) |
| AN | Newspapers (General) |
| AM | Museums (General). Collectors & Collecting (General) |
| AP | Periodicals (General) |
| AS | Academies & Learned Societies |
| AY | Yearbooks. Almanacs. Directories |
| AZ | History of Scholarship |
| B | Philosophy, Psychology, Religion |
| B | Philosophy (General) |
| BC | Logic |
| BD | Speculative Philosophy (Metaphysics, Cosmology. Epistemology, Ontology, etc.) |
| BF | Psychology. Parapsychology. Occult Sciences |
| BH | Aesthetics |
| BJ | Ethics. Social Usage. Etiquette |
| BL | Religion: Religions, Mythology, Natural Theology, Hinduism, Jainism, Semitic, African Rationalism |
| BM | Judaism |
| BP | Islam. Bahaism. Theosophy, etc. |
| BQ | Buddhism |
| BR | Christianity |
| BS | The Bible |
| BT | Doctrinal Theology |
| BV | Practical Theology |
| BX | Christian Denominations |
| C | History: Auxiliary Sciences |
| C | General |
| CB | History of Civilisation |
| CC | Archaeology (General) |
| CD | Archives. Diplomatics. Seals |
| CE | Technical Chronology. Calendar |
| CJ | Numismatics |
| CN | Epigraphy. Inscriptions |
| CS | Genealogy |
| CT | Biography |
| D | History: General & Old World |
| D | General History |
| DA | Great Britain |
| DAW | Central Europe |
| DB | Austria. Hungary. Czechoslovakia |
| DC | France |
| DD | Germany |
| DE | Mediterranean Region. Greco-Roman world |
| DF | Greece |
| DG | Italy |
| DH | Netherlands (Low Countries) |
| DJ | Netherlands (Holland) |
| DK | Russia. Soviet Union. Former Soviet Republics. Poland |
| DL | Scandinavia. Finland |
| DP | Spain. Portugal |
| DQ | Switzerland |
| DR | Balkan Peninsular |
| DS | Asia |
| DT | Africa |
| DU | Australia & Pacific (Oceania, South Seas) |
| DX | Gypsies |
| E | History: America |
| E | America (General). United States (General) |
| F | History: America |
| F | United States (Local). Canada. Latin America |
| G | Geography. Anthropology |
| G | Geography (General). Voyages, Travels, Atlases. Maps. Exploration |
| GA | Cartography. Mathematical Geography |
| GB | Physical Geography. Geomorphology. Hydrology. Natural Disasters |
| GC | Oceanography |
| GE | Environmental Sciences |
| GF | Human Geography. Human Ecology |
| GN | Anthropology. Ethnography. Prehistoric Archaeology |
| GR | Folklore |
| GT | Manners & Customs |
| GV | Sport. Physical Education. Recreation. Leisure |
| H | Social Sciences |
| H | General |
| HA | Statistics |
| HB | Economic Theory. Demography |
| HC | Economic History & Conditions |
| HD | Management. Land Use. Industries. Labour |
| HE | Transportation & Communications |
| HF | Commerce. Accounting |
| HG | Finance: Money, Banking, Investment, Insurance |
| HJ | Public Finance: Revenue, Taxation, Expenditure, Public Credit |
| HM | Sociology |
| HN | Social History & Conditions. Social Problems. Social Reform |
| HQ | Family. Marriage. Women |
| HS | Societies: Secret, Benevolent, etc. |
| HT | Urban & Regional Studies. Communities. Classes. Races |
| HV | Social Pathology. Social & Public Welfare. Criminology. Penology |
| HX | Socialism. Communism. Anarchism |
| J | Political Science |
| J | Official Gazettes. Documents. Parliamentary Papers. Debates |
| JA | General Works |
| JC | Political Theory |
| JF | Political Institutions & Public Administration (General) |
| JK | United States |
| JL | Canada. Latin America |
| JN | Europe |
| JQ | Asia. Africa. Australia. Pacific Islands |
| JS | Local Government |
| JV | Emigration. Immigration. Colonies & Colonisation. International Migration |
| JX | International Law |
| JZ | International Relations |
| K | Law |
| K | Law Journals. Reviews. Jurisprudence. Philosophy & Theory of Law. Comparative Law. Conflict of Laws |
| KB | Ancient Law |
| KD | United Kingdom |
| KDZ | America (General). North America (General) |
| KE | Canada |
| KF | United States |
| KG | Latin America & West Indies |
| KH | South America |
| KJ-KKZ | Europe |
| KL | History of Law. The Ancient Orient |
| KLA-KLW | Eurasia (including Russia) |
| KM-KPZ | Asia |
| KQ-KTZ | Africa |
| KTA-KTC | Australia & New Zealand (works catalogued before 1994) |
| KU-KUN | Australia (works catalogued 1994+) |
| KUQ | New Zealand (works catalogued 1994+) |
| KV-KWX | Pacific Area. Antarctica |
| KZ | Law of Nations |
| KZA | Law of the Sea |
| KZD | Space Law |
| L | Education |
| L | General |
| LA | History of Education |
| LB | Theory & Practice of Education: Teaching, Educational Psychology, Teacher Training, Curriculum, School Administration & Organisation |
| LC | Special Forms of Education: Social Aspects, Economic Aspects, Moral and Religious Education, and Education of Special Classes of Persons |
| LD-LG | Universities and Colleges (Individual Institutions) |
| M | Music |
| M | Scores |
| ML | Literature of Music |
| MT | Instruction & Study |
| N | Fine Arts |
| N | Visual Arts (General) |
| NA | Architecture |
| NB | Sculpture |
| NC | Graphic Arts. Drawing. Design. Illustration |
| ND | Painting |
| NE | Engraving. Prints |
| NK | Decorative Arts. Applied Arts. Decoration and Ornament |
| NX | Arts in General |
| P | Language & Literature |
| P | Philology. Linguistics |
| PA | Classical Languages & Literatures |
| PB | Celtic Languages & Literatures |
| PC | Italian, French, Spanish, Portuguese Languages |
| PD | Germanic Philology & Languages |
| PE | English Language |
| PF | West Germanic Languages |
| PG | Slavic, Baltic, Albanian Languages & Literatures |
| PH | Uralic, Basque Languages & Literatures |
| PJ | Oriental Philology & Literatures |
| PL | Languages & Literatures of Eastern Asia, Africa, Oceania |
| PM | Artificial Languages |
| PN | Literature (General). Drama, Prose, Journalism. The Performing Arts. Show Business. Oratory. Collections of General Literature |
| PQ | French, Italian, Spanish, Portuguese Literatures |
| PR | English Literature (incl. Australia, New Zealand, Canada, West Indies) |
| PRX | Literature Written in English (Africa, Asia, South America) |
| PS | American Literature |
| PT | Germanic Literatures |
| PZ | Children's Literature |
| Q | Science |
| Q | General |
| QA | Mathematics. Computing. Mathematical Statistics |
| QB | Astronomy, Astrophysics |
| QC | Physics. Geophysics. Meteorology |
| QD | Chemistry. Crystallography |
| QE | Geology. Mineralogy. Petrology. Seismology. Palaeontology |
| QH | Natural History. Biology. Biochemistry. Genetics. Ecology |
| QK | Botany |
| QL | Zoology |
| QM | Human Anatomy |
| QP | Physiology. Endocrinology. Pharmacology |
| QR | Bacteriology. Microbiology. Immunology. Virology |
| R | Medicine |
| R | General |
| RA | Public Health. Medical Geography. Toxicology. Environmental Health |
| RB | Pathology |
| RC | Internal Medicine. Neurology. Psychiatry. Geriatrics. Industrial Medicine. Radiology |
| RD | Surgery |
| RE | Ophthalmology |
| RF | Diseases of Ear, Nose, & Throat |
| RG | Gynaecology. Obstetrics |
| RJ | Paediatrics |
| RM | Therapeutics: Occupational Therapy, Physiotherapy, Pharmacology |
| RS | Pharmacy. Materia Medica |
| RT | Nursing |
| RX | Homeopathy |
| RZ | Other Systems of Medicine (Chiropractic, Osteopathy. etc.) |
| S | Agriculture |
| S | Agriculture (General). Soils. Soil Science |
| SB | Horticulture. Field Crops. Pests & Diseases |
| SD | Forestry |
| SF | Animal Husbandry & Breeding. Veterinary Medicine |
| SH | Aquaculture. Fisheries. Angling |
| SK | Hunting. Wildlife Management. Game Protection |
| T | Technology |
| T | General |
| TA | Engineering (General). Civil Engineering. Surveying |
| TC | Hydraulic Engineering |
| TD | Environmental Technology. Environmental Protection. Pollution. Sanitary Engineering |
| TE | Highway Engineering. Roads & Pavements |
| TF | Railway Engineering & Operation |
| TG | Bridge Engineering |
| TH | Building Construction |
| TJ | Mechanical Engineering & Machinery |
| TK | Electrical Engineering. Electronics. Nuclear Engineering |
| TL | Motor Vehicles. Aeronautics. Astronautics |
| TN | Mining Engineering. Metallurgy |
| TP | Chemical Technology |
| TR | Photography |
| TS | Manufactures. Textiles |
| TT | Handicrafts. Arts and Crafts. Fashion |
| TX | Home Economics. Cookery |
| U | Military Science |
| U | Military Life. History of Arms & Armour |
| UA | Armies: Organisation, Description, Military Situation |
| UB | Military Administration |
| UG | Military Engineering. Air Forces. Air Warfare. Space Warfare |
| UH | Other Services (Chaplains, Medical, etc.) |
| V | Naval Science |
| V | General |
| VA | Navies: Organisation, Description, Naval Situation |
| VB | Naval Administration |
| VG | Other Services (Coast Guard, Chaplains, Naval Aviation, etc.) |
| VK | Navigation. Shipwrecks. Merchant Marine |
| VM | Naval Architecture. Shipbuilding. Marine Engineering |
| Z | Bibliography (General) & Library Science |
| Z | History of Books and Bookmaking. Book Industries & Trade. Publishing. Censorship. Librarianship. Bibliography |
| ZA | Information Resources (General) |