| Board + | PD:Users + |
| Boogie-woogie + | Jazz + |
| Book by content + | Books + |
| Books + | Literature by medium +, Publications by format +, Written communication +, … |
| Branches of geography + | Geography +, Subfields by academic discipline + |
| Branches of philosophy + | Subfields by academic discipline +, Philosophy by field + |
| Branches of sociology (interdisciplinary) + | Subfields of sociology +, Interdisciplinary fields + |
| British record labels + | British media +, British music industry +, Record labels by country + |
| Broadcast engineering + | Broadcasting + |
| Broadcasting + | Media by format +, Telecommunications + |
| Building materials + | Materials +, Architecture +, Construction + |
| Buildings and structures + | Architecture +, Creative works + |
| Buildings and structures by type + | Buildings and structures +, Categories by type + |
| Business + | Society +, Main topic classifications + |
| Business timelines + | Society-related timelines +, Business + |
| CD Recording (CDR) + | Departments of the SOSETH + |
| Canton of Zurich + | Cantons of Switzerland + |
| Cantons + | Administrative divisions + |
| Cantons by country + | Subdivisions by country +, Cantons +, Categories by country + |
| Cantons of Switzerland + | Subdivisions of Switzerland +, Cantons by country +, Country subdivisions of Europe + |
| Carbon compounds + | Chemical compounds by element + |
| Catalog numbering systems for single records + | Music industry +, Authentication methods + |
| Categories + | Contents + |
| Categories by canton of Switzerland + | Cantons of Switzerland +, Categories by country subdivision + |
| Categories by continent + | Continents +, Categories by geographical location + |
| Categories by country + | Categories by geographical location + |
| Categories by country subdivision + | Categories by geographical location +, Country subdivisions + |
| Categories by genre + | Categories by topic +, Genres + |
| Categories by geographical location + | Contents + |
| Categories by medium + | Categories by topic +, Mass media +, Categories by parameter + |
| Categories by nationality + | Nationality +, Categories by topic +, Categories by country + |
| Categories by parameter + | Categories + |
| Categories by region + | Categories by geographical location +, Regions + |
| Categories by time + | Categories by topic +, Chronology + |
| Categories by topic + | Categories by parameter + |
| Categories by type + | Categories + |
| Categories by year + | Categories by time +, Years + |
| Categories named after countries + | Categories named after populated places + |
| Categories named after populated places + | Earth + |
| Categories which are included in the JEL classification codes + | PD project Economics + |
| Centuries + | Chronology + |
| Centuries in the future + | Centuries +, Time periods in the future + |
| Chamber music + | Classical music by genre + |
| Chanson + | Folk +, Song forms + |
| Chanson (Shellac disc) + | Chanson +, Shellac disc + |
| Charitable organizations + | Organizations by subject +, Welfare and service organizations + |
| Charities by country + | Charitable organizations +, Non-profit organizations by country +, Organizations by subject and country +, … |
| Chemical compounds + | Chemistry + |
| Chemical compounds by element + | Chemical compounds + |
| Chemical mixtures + | Chemical substances + |
| Chemical substances + | Chemistry +, Materials + |
| Chemical substances by structural element + | Chemical substances + |
| Chemicals substances by use + | Chemical substances + |
| Chemistry + | Natural sciences +, Physical sciences + |
| Chlorine compounds + | Chemical compounds by element +, Halogen compounds + |
| Chloroalkanes + | Organochlorides +, Alkanes + |
| Choral compositions + | Classical music by genre +, Religious music +, Musical compositions +, … |
| Chronology + | History +, Time +, Main topic classifications + |
| Cinematic techniques + | Film +, Engineering disciplines + |
| Civil law (common law) + | Law by issue + |
| Civil law (legal system) + | Law + |
| Classical music + | Music by genre + |
| Classical music by genre + | Classical music + |
| Classical music by period + | Classical music + |
| Classical period + | Classical music by period + |
| Classification by decade + | Categories by time + |
| Cognition + | Philosophy of mind + |
| Cognitive science + | Interdisciplinary fields +, Scientific disciplines + |
| Collection by patron + | Patrons of music + |
| Columbia Records (United States) + | Sony Music Entertainment (United States) + |
| Communication + | Main topic classifications + |
| Communication engineering + | Electronic engineering +, Engineering disciplines +, Telecommunications + |
| Community + | Social systems + |
| Companies + | Economics +, Organizations by type + |
| Companies by industry + | Companies +, Industries +, Categories by topic + |
| Composer + | Musician +, Person (Music) + |
| Composite video formats + | Video formats + |
| Computer engineering + | Computer science +, Engineering disciplines + |
| Computer hardware + | Computer engineering +, Information technology + |
| Computer science + | Scientific disciplines + |
| Concepts + | Fundamental categories +, Thought + |
| Concepts by field + | Concepts +, Categories by topic + |
| Concepts in ethics + | Ethics +, Philosophical concepts + |
| Concepts in metaphysics + | Metaphysics +, Philosophical concepts + |
| Construction + | Industries +, Real estate + |
| Consumer electronics + | Electronics +, Personal life + |
| Containers + | Tools +, Packaging + |
| Contemporary history + | Historical eras +, Fields of history + |
| Content portals + | Portals + |
| Continents + | Geographic feature +, Plate tectonics + |
| Copyright by period + | Copyright law +, Categories by time + |
| Copyright law + | Intellectual property law +, Law by issue +, Plagiarism + |
| Copyright law organizations + | Legal organizations +, Copyright law +, Law-related professional associations + |
| Copyright term (Copyright law) + | Copyright law + |
| Core issues in ethics + | Ethics + |
| Corporate groups + | Corporatism +, Society + |
| Corporatism + | Political culture +, Political philosophy +, Political ideologies +, … |
| Countries + | Political geography +, Places +, Earth + |
| Countries by continent + | Countries +, Categories by continent + |
