| Collaborative e-democracy | Collaborative leadership | Collaborative planning, forecasting, and replenishment |
| Collaborative software | Collagen | Collagenase |
| Collagenases | Collar (clothing) | Collar pin |
| Collateral (film) | Collateral (finance) | Collateral Damage (film) |
| Collatz conjecture | Collège Saint Joseph – Antoura | Collbran, Colorado |
| Colle's fracture | Collecting | Collecting duct system |
| Collective action | Collective agreement | Collective bargaining |
| Collective behavior | Collective Behaviour | Collective capitalism |
| Collective consciousness | Collective Digital Studio | Collective farming |
| Collective for Research and Training on Development-Action | Collective intelligence | Collective intentionality |
| Collective leadership | Collective narcissism | Collective security |
| Collective unconscious | Collectivism | Collectivist anarchism |
| Collectivity of Saint Martin | Colleen Clinkenbeard | College |
| College and university rankings | College City, Arkansas | College Corner, Ohio |
| College football | College of Chemical Sciences | College of Engineering and Technology, Bhubaneswar |
| College of Medicine at Urbana-Champaign | College of Science – University of Baghdad | College Park, Georgia |
| College Park, Maryland | College Place, Washington | College Springs, Iowa |
| College Station, Texas | Collegedale, Tennessee | Collegii Ambrosiani |
| Collegium Artium | Collembola | Colles' fracture |
| Colletto Fava | Colleyville, Texas | Collider |
| Collier County, Florida | Collier Trophy | Collierville, Tennessee |
| Colligative properties | Collin Benjamin | Collin Samuel |
| Colline-Beaumont | Collines-du-Basque, Quebec | Collins English Dictionary |
| Collins John | Collins Mbesuma | Collins, Georgia |
| Collins, Iowa | Collins, Mississippi | Collins, Missouri |
| Collins, New York | Collinson | Collinsonia |
| Collinsonia anisata | Collinsonia australis | Collinsonia canadensis |
| Collinsonia elsholtzioides | Collinsonia glandulosa | Collinsonia japonica |
| Collinsonia macrobracteata | Collinsonia punctata | Collinsonia serotina |
| Collinsonia sinensis | Collinsonia szechuanensis | Collinsonia verticillata |
| Collinsville, Connecticut | Collinsville, Illinois | Collinsville, Oklahoma |
| Collinsville, Texas | Collinwood, Tennessee | Collision |
| Collision Course | Collision course | Collision domain |
| Collision theory | Collo | Collocalia esculenta |
| Collodion | Colloid | Colloidal crystal |
| Colloidion bag | Collongues, Alpes-Maritimes | Colloquialism |
| Collyer, Kansas | Colm Feore | Colm Meaney |
| Colman, South Dakota | Colmar Manor, Maryland | Colmenar de Oreja |
| Colmenar del Arroyo | Colmenar Viejo | Colmesneil, Texas |
| Colo, Iowa | Colobanthus | Colobanthus acicularis |
| Colobanthus affinis | Colobanthus apetalus | Colobanthus bolivianus |
| Colobanthus buchananii | Colobanthus caespitosus | Colobanthus kerguelensis |
| Colobanthus monticola | Colobanthus muscoides | Colobanthus pulvinatus |
| Colobanthus quitensis | Colobinae | Colobini |
| Colobomycter | Colobus | Colobus angolensis |
| Colobus guereza | Colobus polykomos | Colobus satanas |
| Colobus vellerosus | Colocasia esculenta | Colocation centre |
| Colofac | Cologne | Cologne Bonn Airport |
| Cologne Cathedral | Cologne Central Mosque | Cologne, Minnesota |
| Coloma Charter Township, Michigan | Coloma, Michigan | Coloma, Wisconsin |
| Colomars | Colomán Trabado | Colombia |
| Colombian armed conflict (1964–present) | Colombian Constitution of 1991 | Colombian peso |
| Colombian Weasel | Colombian weasel | Colombier, Quebec |
| Colombo | Colome, South Dakota | Colon (anatomy) |
| Colon (punctuation) | Colon Township, Michigan | Colon, Michigan |
| Colon, Nebraska | Colona, Illinois | Colonel |
| Colonial Beach, Virginia | Colonial Heights, Virginia | Colonialism |
| Colonie (village), New York | Colonie, New York | Colonoscopy |
| Colony | Colony (biology) | Colony counter |
| Colony, Kansas | Colony, Oklahoma | Colony-stimulating factor |
| Color | Color balance | Color blindness |
| Color charge | Color constancy | Color depth |
| Color Graphics Adapter | Color management | Color model |
| Color photography | Color solid | Color space |
| Color symbolism | Color temperature | Color term |
| Color theory | Color TV Game | Color TV-Game |
| Color vision | Color wheel | Colorado |
| Colorado City, Arizona | Colorado City, Texas | Colorado Plateau |
| Colorado School of Mines | Colorectal polyp | Colored dissolved organic matter |
| Colored gold | Colorfulness | Colorimeter (chemistry) |
| Colorimetry | Coloring algorithm | Colorpoint Shorthair |
| Colossal squid | Colosseum | Colostomy |
| Colostrum | Colour Index International | Colour revolution |
| Colourant | Colp, Illinois | Colquitt, Georgia |
| Colrain, Massachusetts | Colroy-la-Roche | Colstrip, Montana |
| Colt Mk 12 cannon | Colt, Arkansas | Coltan |
| Colton, New York | Colton, South Dakota | Colton, Washington |
| Coluber | Coluber andreanus | Coluber brevis |
| Coluber constrictor | Coluber elegantissimus | Coluber florulentus |
| Coluber gracilis | Coluber insulanus | Coluber nummifer |
| Coluber rubriceps | Coluber sinai | Coluber smithi |
| Coluber socotrae | Coluber somalicus | Coluber thomasi |
| Coluber variabilis | Coluber ventromaculatus | Coluber vittacaudatus |
| Coluber zebrinus | Colubridae | Colubrina |
| Colubrinae | Colubroidea | Columba |
| Columba arquatrix | Columba livia | Columba livia domestica |
| Columba oenas | Columba palumbus | Columbia (supercomputer) |
| Columbia City, Indiana | Columbia City, Oregon | Columbia County, Florida |
| Columbia Falls, Maine | Columbia Falls, Montana | Columbia Pictures |
| Columbia Records | Columbia Sportswear | Columbia Township, Jackson County, Michigan |
| Columbia Township, Tuscola County, Michigan | Columbia Township, Van Buren County, Michigan | Columbia University |
| Columbia, Connecticut | Columbia, Illinois | Columbia, Kentucky |
| Columbia, Louisiana | Columbia, Maine | Columbia, Maryland |
| Columbia, Mississippi | Columbia, New Hampshire | Columbia, New York |
| Columbia, South Carolina | Columbia, South Dakota | Columbia, Tennessee |
| Columbia, Virginia | Columbian Exchange | Columbiana, Ohio |
| Columbiaville, Michigan | Columbidae | Columbiformes |
| Columbine Valley, Colorado | Columbite | Columbus (town), Wisconsin |
| Columbus City, Iowa | Columbus day | Columbus Junction, Iowa |
| Columbus Short | Columbus Township, Luce County, Michigan | Columbus Township, St. Clair County, Michigan |
